target: msm8974: Modify ctrl sequence of target_backlight_ctrl
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

Foxda-Tech/argo8-bootable-bootloader-lk,M1cha/lktris,M1cha/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,jsr-d10/android_bootable_bootloader_lk,efidroid/lk,Foxda-Tech/polaris-bootable-bootloader-lk,M1cha/android_bootable_bootloader_lk,efidroid/lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/argo8-bootable-bootloader-lk,jsr-d10/android_bootable_bootloader_lk,jsr-d10/android_bootable_bootloader_lk,CanarySolutions/little-kernel,jsr-d10/android_bootable_bootloader_lk,Foxda-Tech/argo8-bootable-bootloader-lk,efidroid/lk,M1cha/android_bootable_bootloader_lk,Foxda-Tech/polaris-bootable-bootloader-lk,CanarySolutions/little-kernel,Foxda-Tech/argo8-bootable-bootloader-lk,M1cha/lktris,Foxda-Tech/polaris-bootable-bootloader-lk,M1cha/android_bootable_bootloader_lk,efidroid/lk,CanarySolutions/little-kernel,M1cha/lktris,CanarySolutions/little-kernel,Foxda-Tech/polaris-bootable-bootloader-lk,M1cha/lktris,Foxda-Tech/argo8-bootable-bootloader-lk,M1cha/android_bootable_bootloader_lk,jsr-d10/android_bootable_bootloader_lk,efidroid/lk,CanarySolutions/little-kernel,M1cha/lktris