Add libtextclassifier to hwasan-postsubmit am: c19a0d46b3

Original change: https://android-review.googlesource.com/c/platform/external/libtextclassifier/+/2032825

Change-Id: I4e4716e125756ffe67c6a31dcc435165bc429b3b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>