Fix one and hide the other warnings from core/jni

Most of the warnings are unused parameter from skia functions.

Change-Id: I9df57718d117c26b96163f751ccb056ca86ac072
Don't try to set service.bootanim.exit

init has never allowed the bootanimation code to
set service.bootanim.exit, and has always generated the
dmesg error message

  <3>[   17.644615] init: sys_prop: permission denied uid:1003  name:service.bootanim.exit

Since setting this property has no effect and never worked, delete
the code which tries to do it.

Change-Id: Idacc5467d85479a8cf974702af8895011be585ea