dt-bindings: clock: Move lochnagar.h to dt-bindings/clock

dt-bindings: clock: Move lochnagar.h to dt-bindings/clock

Most of the clock-related dt-binding header files are located in
include/dt-bindings/clock. It would be good to keep all the similar
header files at a single location.

This was discovered while investigating the state of ownership of the files
in include/dt-bindings/ according to the MAINTAINERS file.

This change here is similar to commit 8e28918a85a0 ("dt-bindings: clock:
Move ti-dra7-atl.h to dt-bindings/clock") and commit 35d35aae8177
("dt-bindings: clock: Move at91.h to dt-bindigs/clock").

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20220613081632.2159-2-lukas.bulwahn@gmail.com
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>