samples: net: wifi: Add apsta_mode configurations for rw612.

Add more apsta_mode configurations for frdm_rw612
and rd_rw612_bga.

Add overlay file to set apsta_mode configurations.

Signed-off-by: Qiankun Li <[email protected]>

Author: Liam-qk

samples/net/wifi/apsta_mode/nxp/overlay_rw612.conf

@@ -0,0 +1,6 @@
+# apsta_mode configuration
+CONFIG_WIFI_SAMPLE_AP_SSID="RW612_AP"
+CONFIG_WIFI_SAMPLE_AP_PSK=""
+CONFIG_WIFI_SAMPLE_SSID="TEST_AP"
+CONFIG_WIFI_SAMPLE_PSK="PASSWORD"
+CONFIG_WIFI_SAMPLE_DHCPV4_START=n