dt-bindings: phy: Add PHY_TYPE_USXGMII definition

Add definition for USXGMII phy type.

Cc: Rob Herring <[e-mail]>
Signed-off-by: Swapnil Jakhade <[e-mail]>
Signed-off-by: Roger Quadros <[e-mail]>
Acked-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

include/dt-bindings/phy/phy.h

···
 #define PHY_TYPE_QSGMII		9
 #define PHY_TYPE_DPHY		10
 #define PHY_TYPE_CPHY		11
+#define PHY_TYPE_USXGMII	12
 
 #endif /* _DT_BINDINGS_PHY */