dt-bindings: phy-mtk-tphy: add support mt8195

Add a new compatible for mt8195 to add a workaround for hardware
issue.

diff --git a/doc/device-tree-bindings/phy/phy-mtk-tphy.txt b/doc/device-tree-bindings/phy/phy-mtk-tphy.txt
index 8cd23d8..3042c39 100644
--- a/doc/device-tree-bindings/phy/phy-mtk-tphy.txt
+++ b/doc/device-tree-bindings/phy/phy-mtk-tphy.txt
@@ -8,6 +8,7 @@
  - compatible	: should be one of
 		  "mediatek,generic-tphy-v1"
 		  "mediatek,generic-tphy-v2"
+		  "mediatek,mt8195-tphy"
 
 - #address-cells:	the number of cells used to represent physical
 		base addresses.