Add new products aosp_x86_ab and aosp_x86_64_ab

The product is for GSI with x86 64-bits and 32-bits with A/B
update.

Bug: 38339398
Test: Build pass
Change-Id: I1f945a812e0fbf8c4266d2f91624c2c674941383
Merged-In: I1f945a812e0fbf8c4266d2f91624c2c674941383
(cherry picked from commit 06956fe5)