[MTE] [CFI] Fix CFI -> diag promotion with memtag_heap.

Small typo in the AndroidMk sanitizer config, where adding heap MTE
ended up promoting CFI to diagnostic CFI accidentally, where this isn't
a valid transformation.

Bug: 184397138
Test: lunch aosp_sunfish-userdebug
Test: PRODUCT_MEMTAG_HEAP_ASYNC_INCLUDE_PATHS=\
Test: "hardware/qcom frameworks/opt/net/wifi" \
Test: CFI_INCLUDE_PATHS=hardware/qcom \
Test: m libwifi-hal
Change-Id: I74a03debf0042f2ee004503dd4a0e81131bd9fde