Remove unused getRenderScript

`getRenderScript` is never actually used, now that `RenderScript` is
deprecated we can go ahead and remove it.

Bug: 266947193
Test: m SmartCamera
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:80c54ee85c4c8863ccf55b1d49b313499622ae04)
Merged-In: Id38295ebf0d240f34e162471c53ff266262b2f0e
Change-Id: Id38295ebf0d240f34e162471c53ff266262b2f0e
1 file changed