dt-bindings: net: fsl,fman: add ptimer-handle property

Add ptimer-handle property to link to ptp-timer node handle.
Fix below warning:
arch/arm64/boot/dts/freescale/fsl-ls1043a-rdb.dtb: fman@1a00000: 'ptimer-handle' do not match any of the regexes: '^ethernet@[a-f0-9]+$', '^mdio@[a-f0-9]+$', '^muram@[a-f0-9]+$', '^phc@[a-f0-9]+$', '^port@[a-f0-9]+$', 'pinctrl-[0-9]+'

Reviewed-by: Rob Herring (Arm) <[e-mail]>
Signed-off-by: Frank Li <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

Documentation/devicetree/bindings/net/fsl,fman.yaml

···
 
   dma-coherent: true
 
+  ptimer-handle:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: see ptp/fsl,ptp.yaml
+
   fsl,qman-channel-range:
     $ref: /schemas/types.yaml#/definitions/uint32-array
     description: