Use srcjar and resource zip as output of renderscript rules

Replace RenderScript.stamp with a srcjar, with a resource zip as
an implicit output.  This makes the renderscript rules self contained,
which will make it easier to move them before aapt.

Bug: 73885582
Test: m checkbuild
Change-Id: I12d33e52019aebac6ea33271939228e4690a4173