Add CPU_ABIs for the second generic_arm64 architecture.

This was accidentally removed by commit 8dc227f48214dd9c38c82.
Breaks builds for apps that use gnustl_static for 32 bit compiles
on an arm64 target.

bug: 16951392

Change-Id: I89480943284944fd95543cccbf40a8de22852197
1 file changed