leds: Make flash and multicolor dependencies unconditional

Along the same lines as making devm_led_classdev_register() declared
extern unconditional, do the same thing for the two sub-classes
that have similar stubs.

The users of these interfaces go to great lengths to allow building
with both the generic leds API and the extended version, but realistically
there is not much use in this, so just simplify it to always rely
on it and remove the confusing fallback logic.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20240109090715.982332-2-arnd@kernel.org


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