MAINTAINERS: add include/dt-bindings/phy to GENERIC PHY FRAMEWORK

Maintainers of the directory Documentation/devicetree/bindings/phy
are also the maintainers of the corresponding directory
include/dt-bindings/phy.

Add the file entry for include/dt-bindings/phy to the appropriate
section in MAINTAINERS.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20220613122621.18397-1-lukas.bulwahn@gmail.com


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