leds: flash: leds-qcom-flash: Limit LED current based on thermal condition

leds: flash: leds-qcom-flash: Limit LED current based on thermal condition

The flash module has status bits to indicate different thermal
conditions which are called as OTSTx. For each OTSTx status,
there is a recommended total flash current for all channels to
prevent the flash module entering into higher thermal level.
For example, the total flash current should be limited to 1000mA/500mA
respectively when the HW reaches the OTST1/OTST2 thermal level.

Signed-off-by: Fenglin Wu <quic_fenglinw@quicinc.com>
Link: https://lore.kernel.org/r/20240705-qcom_flash_thermal_derating-v3-1-8e2e2783e3a6@quicinc.com
Signed-off-by: Lee Jones <lee@kernel.org>