dt-bindings: phy: add qcom,hdmi-phy-8998

HDMI PHY block embedded in the APQ8098.

Acked-by: Rob Herring (Arm) <[e-mail]>
Acked-by: Vinod Koul <[e-mail]>
Signed-off-by: Marc Gonzalez <[e-mail]>
Patchwork: https://patchwork.freedesktop.org/patch/605634/
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Dmitry Baryshkov <[e-mail]>

Documentation/devicetree/bindings/phy/qcom,hdmi-phy-qmp.yaml

···
   compatible:
     enum:
       - qcom,hdmi-phy-8996
+      - qcom,hdmi-phy-8998
 
   reg:
     maxItems: 6