Disable CFI for ASAN targets. (Make)

This CL disables CFI if both CFI and ASAN flags are enabled. This
allows ASAN to take precedence where needed, preventing build errors
that would otherwise arise.

Bug: 30227045
Test: SANITIZE_TARGET="address" m -j40
Change-Id: I9073ace0a10eb554d14e418a9b23cc8a8277607d