Avoid duplicated module name for vndk_prebuilt_shared

There may have prebuilt files that share a single name causing
duplicated module name error. Fix this bug by generating the
vndk_prebuilt_shared module per each module name.

Bug: 225265099
Bug: 225243872
Test: development/vndk/snapshot/gen_buildfiles.py
Change-Id: I2f6df9956d33b2ed0e901d73c93621ff4727370d
1 file changed