dt: fix broken links due to txt->yaml renames

There are some new broken doc links due to yaml renames
at DT. Developers should really run:

./scripts/documentation-file-ref-check

in order to solve those issues while submitting patches.
This tool can even fix most of the issues with:

./scripts/documentation-file-ref-check --fix

Acked-by: Thomas Bogendoerfer <[e-mail]>
Acked-by: Mark Brown <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Link: https://lore.kernel.org/r/0e4a7f[e-mail]
Signed-off-by: Rob Herring <[e-mail]>

Documentation/devicetree/bindings/display/bridge/sii902x.txt

···
 	simple-card or audio-graph-card binding. See their binding
 	documents on how to describe the way the sii902x device is
 	connected to the rest of the audio system:
-	Documentation/devicetree/bindings/sound/simple-card.txt
+	Documentation/devicetree/bindings/sound/simple-card.yaml
 	Documentation/devicetree/bindings/sound/audio-graph-card.txt
 	Note: In case of the audio-graph-card binding the used port
 	index should be 3.

Documentation/devicetree/bindings/display/rockchip/rockchip-drm.yaml

···
     description: |
       Should contain a list of phandles pointing to display interface port
       of vop devices. vop definitions as defined in
-      Documentation/devicetree/bindings/display/rockchip/rockchip-vop.txt
+      Documentation/devicetree/bindings/display/rockchip/rockchip-vop.yaml
 
 required:
   - compatible

Documentation/devicetree/bindings/net/mediatek-bluetooth.txt

···
 
 This device is a serial attached device to BTIF device and thus it must be a
 child node of the serial node with BTIF. The dt-bindings details for BTIF
-device can be known via Documentation/devicetree/bindings/serial/8250.txt.
+device can be known via Documentation/devicetree/bindings/serial/8250.yaml.
 
 Required properties:
 

Documentation/devicetree/bindings/sound/audio-graph-card.txt

···
 see ${LINUX}/Documentation/devicetree/bindings/graph.txt
 
 Basically, Audio Graph Card property is same as Simple Card.
-see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.txt
+see ${LINUX}/Documentation/devicetree/bindings/sound/simple-card.yaml
 
 Below are same as Simple-Card.
 

Documentation/devicetree/bindings/sound/st,sti-asoc-card.txt

···
 
 sti sound drivers allows to expose sti SoC audio interface through the
 generic ASoC simple card. For details about sound card declaration please refer to
-Documentation/devicetree/bindings/sound/simple-card.txt.
+Documentation/devicetree/bindings/sound/simple-card.yaml.
 
 1) sti-uniperiph-dai: audio dai device.
 ---------------------------------------

Documentation/mips/ingenic-tcu.rst

···
 drivers access their registers through the same regmap.
 
 For more information regarding the devicetree bindings of the TCU drivers,
-have a look at Documentation/devicetree/bindings/timer/ingenic,tcu.txt.
+have a look at Documentation/devicetree/bindings/timer/ingenic,tcu.yaml.

MAINTAINERS

···
 S:	Supported
 F:	drivers/char/hw_random/cctrng.c
 F:	drivers/char/hw_random/cctrng.h
-F:	Documentation/devicetree/bindings/rng/arm-cctrng.txt
+F:	Documentation/devicetree/bindings/rng/arm-cctrng.yaml
 W:	https://developer.arm.com/products/system-ip/trustzone-cryptocell/cryptocell-700-family
 
 CEC FRAMEWORK
···
 DRM DRIVER FOR RAYDIUM RM67191 PANELS
 M:	Robert Chiras <[e-mail]>
 S:	Maintained
-F:	Documentation/devicetree/bindings/display/panel/raydium,rm67191.txt
+F:	Documentation/devicetree/bindings/display/panel/raydium,rm67191.yaml
 F:	drivers/gpu/drm/panel/panel-raydium-rm67191.c
 
 DRM DRIVER FOR ROCKTECH JH057N00900 PANELS