samples: wifi: provisioning: ble: Reduce RAM usage

Optimize RAM usage by decreasing driver RX buffers.

Signed-off-by: Triveni Danda <[email protected]>
(cherry picked from commit 6fbb1a3)

Author: D-Triveni

samples/wifi/provisioning/ble/prj.conf

@@ -56,6 +56,7 @@ CONFIG_NET_SOCKETS_POLL_MAX=10
 CONFIG_MAIN_STACK_SIZE=5200
 CONFIG_NET_TX_STACK_SIZE=4096
 CONFIG_NET_RX_STACK_SIZE=4096
+CONFIG_NRF70_RX_NUM_BUFS=16
 
 # Debugging
 CONFIG_STACK_SENTINEL=y