leds: rgb: Update PM8350C lpg_data to support two-nvmem PPG Scheme

Update the pm8350c lpg_data struct so that pm8350c devices are treated as
PWM devices that support two-nvmem PPG scheme.

Signed-off-by: Anjelique Melendez <quic_amelende@quicinc.com>
Link: https://lore.kernel.org/r/20231221185838.28440-8-quic_amelende@quicinc.com


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