Remove unused RenderScript functions from Camera

Remove unused `createPreviewAllocation` and
`setPreviewCallbackAllocation` functions from `Camera`.

Bug: 296813467
Test: atest CtsCameraTestCases
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:aa52270a8e643f7caa264f4e91c78b8030f812be)
Merged-In: I596de3fc844e1c951d8d3cd8fe2e7efc61bec4a1
Change-Id: I596de3fc844e1c951d8d3cd8fe2e7efc61bec4a1
1 file changed