MAINTAINERS: update mtd-physmap.yaml reference

Changeset 63f8e9e0ac65 ("dt-bindings: mtd: Convert mtd-physmap to DT schema")
renamed: Documentation/devicetree/bindings/mtd/arm-versatile.txt
and: Documentation/devicetree/bindings/mtd/cypress,hyperflash.txt
to: Documentation/devicetree/bindings/mtd/mtd-physmap.yaml.

Update their cross-references accordingly.

Fixes: 63f8e9e0ac65 ("dt-bindings: mtd: Convert mtd-physmap to DT schema")
Acked-by: Miquel Raynal <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/cdf389[e-mail]

MAINTAINERS

···
 F:	Documentation/devicetree/bindings/clock/arm,syscon-icst.yaml
 F:	Documentation/devicetree/bindings/i2c/i2c-versatile.txt
 F:	Documentation/devicetree/bindings/interrupt-controller/arm,versatile-fpga-irq.txt
-F:	Documentation/devicetree/bindings/mtd/arm-versatile.txt
+F:	Documentation/devicetree/bindings/mtd/mtd-physmap.yaml
 F:	arch/arm/boot/dts/arm-realview-*
 F:	arch/arm/boot/dts/integrator*
 F:	arch/arm/boot/dts/versatile*