tests: Bluetooth: Audio: Increase RX buf count for bsim

The tests were using the default of 1 which is very low,
especially when we might have multiple RX streams.

Signed-off-by: Emil Gydesen <[email protected]>

Author: Thalley

tests/bsim/bluetooth/audio/prj.conf

@@ -46,6 +46,7 @@ CONFIG_BT_ISO_TX_BUF_COUNT=36
 CONFIG_BT_ISO_MAX_CHAN=4
 CONFIG_BT_ISO_TX_MTU=310
 CONFIG_BT_ISO_RX_MTU=310
+CONFIG_BT_ISO_RX_BUF_COUNT=4
 
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n