target: msm8974: Modify ctrl sequence of target_backlight_ctrl

Program WLED modulator enable registers using
pm8x41_wled_led_mod_enable API to change brightness
in bootloader.

CRs-Fixed: 584769
Change-Id: I19edc2ebaf1569c6c55aea7c3c8f4f26e7e70796
1 file changed