target: Remove WEAK definition of target_read_panel_signature
target: Remove WEAK definition of target_read_panel_signature

Function target_read_panel_signature to be moved to msm shared.
Hence remove WEAK definition from target init.

Change-Id: I37d9268971d6050913c995ef5cec1b1111a5ae5b

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