backlight: qcom-wled: Add support for WLED5 peripheral that is present on PM8150L PMICs

PM8150L WLED supports the following:
    - Two modulators and each sink can use any of the modulator
    - Multiple CABC selection options from which one can be selected/enabled
    - Multiple brightness width selection (12 bits to 15 bits)

Signed-off-by: Subbaraman Narayanamurthy <[email protected]>
Signed-off-by: Kiran Gunda <[email protected]>
Reviewed-by: Daniel Thompson <[email protected]>
Signed-off-by: Lee Jones <[email protected]>

Author: Subbaraman Narayanamurthy