target: msm8974: edp back light through lpg channel 8
target: msm8974: edp back light through lpg channel 8

Currently edp back light is controlled by pulling high at
pm-gpio-36 directly. This cause back light inverted at
Android kernel. Fixed back light inverted problem by
control back light through lpg channel #8.

CRs-Fixed: 538278
Change-Id: Ia63bdc1e94ac4600252f215b039cf2227c9c08f9

Foxda-Tech/polaris-bootable-bootloader-lk,jsr-d10/android_bootable_bootloader_lk,efidroid/lk,CanarySolutions/little-kernel,Foxda-Tech/polaris-bootable-bootloader-lk,detule/lk-g2-spr,M1cha/lktris,Foxda-Tech/argo8-bootable-bootloader-lk,CanarySolutions/little-kernel,Foxda-Tech/argo8-bootable-bootloader-lk,M1cha/lktris,M1cha/lktris,Foxda-Tech/argo8-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,M1cha/android_bootable_bootloader_lk,detule/lk-g2-spr,jsr-d10/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,M1cha/android_bootable_bootloader_lk,CanarySolutions/little-kernel,detule/lk-g2-spr,detule/lk-g2-spr,Foxda-Tech/argo8-bootable-bootloader-lk,detule/lk-g2-spr,M1cha/android_bootable_bootloader_lk,Foxda-Tech/polaris-bootable-bootloader-lk,jsr-d10/android_bootable_bootloader_lk,CanarySolutions/little-kernel,jsr-d10/android_bootable_bootloader_lk,M1cha/lktris,M1cha/lktris,jsr-d10/android_bootable_bootloader_lk,Foxda-Tech/argo8-bootable-bootloader-lk,M1cha/android_bootable_bootloader_lk,efidroid/lk,efidroid/lk,efidroid/lk,efidroid/lk,CanarySolutions/little-kernel