Add TEST_MAPPING in attention service

Attention service add an entry in Hotword, we try to add TEST_MAPPING
to run a mini set of voice cts in presubmit to catch test fail earlier.

Bug: 242503165
Test: atest --test-mapping \
frameworks/base/services/core/java/com/android/server/attention

Change-Id: I043aaa787a1b157223ec73960d9390f52a7f8bc4