Fix PSA sim test awk script by removing extra $

Signed-off-by: Tom Cosgrove <tom.cosgrove@arm.com>
diff --git a/tests/psa-client-server/psasim/test/run_test.sh b/tests/psa-client-server/psasim/test/run_test.sh
index 6a5605f..06bcc93 100755
--- a/tests/psa-client-server/psasim/test/run_test.sh
+++ b/tests/psa-client-server/psasim/test/run_test.sh
@@ -17,7 +17,7 @@
     rm -f psa_notify_*
     pkill psa_partition || true
     pkill psa_client || true
-    ipcs | grep q | awk '{ printf " -q " $$2 }' | xargs ipcrm > /dev/null 2>&1 || true
+    ipcs | grep q | awk '{ printf " -q " $2 }' | xargs ipcrm > /dev/null 2>&1 || true
 }
 
 # The server creates some local files when it starts up so we can wait for this