Add net_test_avrcp to general-tests suite

This is the first step for it to run in lab. With this, the test binary
will be included in general-tests.zip (test_suite* target). From there,
we can kick off the test in the lab using TF, with the right options.

Bug: 111921389
Test: m -j net_test_avrcp
./host/linux-x86/testcases/net_test_avrcp/x86_64/net_test_avrcp

Change-Id: I4de9409b4a9d4c066a9024a33d6a980ecb451dc1