zero: Fix gralloc_priv casting
zero: Fix gralloc_priv casting

Change-Id: I13716beac9c91979fadc938a71a90629cc681a04

TeamNexus/android_device_samsung_zero-common,TeamNexus/android_device_samsung_zero-common,TeamNexus/android_device_samsung_zero-common,TeamNexus/android_device_samsung_zero-common,TeamNexus/android_device_samsung_zero-common