native: drop hwui properties on O-MR1

 * In Android 8.1 and later, only the ro.zygote.disable_gl_preload
   property still applies. All other properties have been removed.
   Reference: https://source.android.com/devices/graphics/renderer



Change-Id: Id791029a85bd2ae3ed1c8f38257ea123ac25e61c
Signed-off-by: Abhay Ruparel <abhayruparel2000@gmail.com>