UPSTREAM: leds: flash: Fix multicolor no-ops registration by return 0

Fix multicolor no-ops registration by return 0,
and move the same registration functions outside of #ifdef block.

Signed-off-by: Gene Chen <gene_chen@richtek.com>
Acked-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>

Bug: 260685629
(cherry picked from commit 6039b7e87be0b350a5f8fc135adfb5d1f4ba66ad)
Change-Id: Ieb8cace2978f61bd2de5c576e851987c6ba31e2c
Signed-off-by: Farid Chahla <farid.chahla@sony.com>