turris-omnia-mcu-interface.h: Move macro definitions outside of enums

Move the definitions of enumerator related macros outside of the
enumerator definitions.

Suggested-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/linux-leds/20241212183357.GK7139@google.com/


Signed-off-by: Marek Behún <kabel@kernel.org>
Link: https://lore.kernel.org/r/20241215211323.23364-1-kabel@kernel.org


Signed-off-by: Lee Jones <lee@kernel.org>