zero: increase number of maximal HW overlays
zero: increase number of maximal HW overlays

Change-Id: I226244529da59cc10b3711270adefbde2174fbf8

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