icnss2: Register for co-processor subsystem notifier

WLAN RFA is present on another co-processor subsystem.
Any error fatal in co-processor subsystem will result in
WLAN reset.

In order to make sure that rf clock/rails are up before
accessing WLAN hardware, ICNSS platform driver needs to
register with co-processor SSR notification and wait for
POWER_UP event before starting QMI handshake.

Change-Id: Idf65e508a09d93e481349afc73de4804c7841111

icnss2/debug.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2015-2021, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
  */
 #include <linux/err.h>
 #include <linux/seq_file.h>
@@ -415,6 +416,9 @@ static int icnss_stats_show_state(struct seq_file *s, struct icnss_priv *priv)
 			continue;
 		case ICNSS_QMI_DMS_CONNECTED:
 			seq_puts(s, "DMS_CONNECTED");
+			continue;
+		case ICNSS_SLATE_SSR_REGISTERED:
+			seq_puts(s, "SLATE SSR REGISTERED");
 		}
 
 		seq_printf(s, "UNKNOWN-%d", i);