msm-shared: scm: Properly init SCM command struct on alloc
msm-shared: scm: Properly init SCM command struct on alloc

Init SCM command struct fields (including response and buffers) to zero
on SCM command allocation. This fixes possible error on restore_secure_cfg()
call when the SCM command response buffer is not zero - it appears the
response value is not set which is interpreted as error when it is not zero
by default.

CRs-Fixed: 596993

Change-Id: Ia0e80918765ae8db93c9a126cda640e6352cba42

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