Prevent multiple outstanding permission queries per client

Under stress tests, it's possible for several messages to be sent before
CHRE has time to respond to the permission query which can cause several
permission queries to be sent and CHRE to be overwhelmed.

Fixes: 202201157
Test: Flash device and run stress test
Change-Id: I16871a116216cd288f0eba0e6c5572f5afa6b959