backlight: qcom-wled: Add PM6150L compatible

PM6150L contains WLED of version 5. Add support ofr it to the driver.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Reviewed-by: Daniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: Helge Deller <deller@gmx.de>