target: msm8916: Add shutdown_device support
target: msm8916: Add shutdown_device support

Configure PMIC and drop PS_HOLD for device shutdown.

CRs-Fixed: 646440
Change-Id: Ia84f754dd32a4132a076192350ef045c3432de19

jsr-d10/android_bootable_bootloader_lk,Foxda-Tech/argo8-bootable-bootloader-lk,jsr-d10/android_bootable_bootloader_lk,jsr-d10/android_bootable_bootloader_lk,jsr-d10/android_bootable_bootloader_lk,jsr-d10/android_bootable_bootloader_lk,Foxda-Tech/argo8-bootable-bootloader-lk,Foxda-Tech/argo8-bootable-bootloader-lk,Foxda-Tech/argo8-bootable-bootloader-lk,Foxda-Tech/argo8-bootable-bootloader-lk