Allow abi diffs sanitized variants of vndk libraries on production devices.

Previously abi diffs were allowed only on unsanitized variants of vndk
libraries. This CL allows them on all sanitized variants which go onto
production devices, eg: cfi variants.

Bug: 66301104

Test: Without this change, for arm64 libstagefright_foundation doesn't
      get an lsdump file since we don't build an unsanitized variant
      (aosp_arm64_ab).

Test: With this change, for arm64 libstagefright_foundation does
      get an lsdump file (aosp_arm64_ab)

Change-Id: I94f82fd84fc898e4980c3f3619df9677ed723c32