dt-bindings: phy: Rename Intel Keem Bay USB PHY bindings

This is the only file not using the "intel,keembay-*" pattern.
Fortunately the actual compatible value is already following the
standard scheme.

Fixes: 4086afa2 ("dt-bindings: phy: Add Intel Keem Bay USB PHY bindings")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/91235a64185f7446fc58e638d77691078d3114d1.1626255556.git.geert+renesas@glider.be


Signed-off-by: Vinod Koul <vkoul@kernel.org>