Content adaptive backlight control (CABC) support is needed to control backlight by external PWM. It can be enabled by setting "cabc_en = true" in the platform data wled_cfg structure. CRs-fixed: 379347 Signed-off-by: Amy Maloche <amaloche@codeaurora.org> (cherry picked from commit c366d5bfc380183e1c4f9877b2c8558098bd4281) Change-Id: Iae7940d25d8754ab539d5ce1fa3f78972b5222d1 Signed-off-by: Sudhir Sharma <sudsha@codeaurora.org>