start CGNSSPWR in init chat script, otherwise it does not work later

Author: olalonde

drivers/modem/modem_cellular.c

@@ -2073,6 +2073,7 @@ MODEM_CHAT_SCRIPT_CMDS_DEFINE(simcom_a76xx_init_chat_script_cmds,
 			      MODEM_CHAT_SCRIPT_CMD_RESP_NONE("AT", 100),
 			      MODEM_CHAT_SCRIPT_CMD_RESP_NONE("AT", 100),
 			      MODEM_CHAT_SCRIPT_CMD_RESP("ATE0", ok_match),
+			      MODEM_CHAT_SCRIPT_CMD_RESP("AT+CGNSSPWR=1", ok_match),
 			      MODEM_CHAT_SCRIPT_CMD_RESP("AT+CFUN=4", ok_match),
 			      MODEM_CHAT_SCRIPT_CMD_RESP("AT+CMEE=1", ok_match),
 			      MODEM_CHAT_SCRIPT_CMD_RESP("AT+CREG=1", ok_match),