leds: rgb: leds-qcom-lpg: Allow LED_COLOR_ID_MULTI

leds: rgb: leds-qcom-lpg: Allow LED_COLOR_ID_MULTI

There's nothing special about RGB multi-led instances. Allow any color
combinations by simply extending the "if _RGB" checks.

Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: David Heidelberg <david@ixit.cz>
Link: https://patch.msgid.link/20251117-topic-lpg_multi-v1-1-05604374a2dd@oss.qualcomm.com
Signed-off-by: Lee Jones <lee@kernel.org>