dt-bindings: phy: drop obsolete qcom,usb-8x16-phy bindings

Remove the bindings for the Qualcomm 8x16 PHY driver that was dropped
in commit 4756f35 ("usb: phy: remove phy-qcom-8x16-usb.c") in 2017.

Signed-off-by: Rayyan Ansari <[email protected]>
Reviewed-by: Rob Herring (Arm) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: RayyanAnsari