icnss2: Add Low power mode to icnss driver state

Deep Sleep is a system wide low power mode during which
Modem would be brought down and DDR would be in self
refresh mode (suspend-to-RAM) thus platform driver on
receiving deep sleep indication goes to a state similar
to SSR apart from the fact that FW is not crashed but
deliberately brought down.

In msm-5.15, there are no seperate notifications used
for deep sleep, notifications used for hibernate like
BEFORE_SHUTDOWN, AFTER_SHUTDOWN, BEFORE_POWERUP and
AFTER_POWERUP are used for deep sleep also.

In this commit add only low power mode state to
icnss driver state.

Change-Id: I4b12c5a8841e3cfc3e5e44ab6d9dff141e472876
CRs-Fixed: 3394501

icnss2/debug.c

@@ -422,6 +422,9 @@ static int icnss_stats_show_state(struct seq_file *s, struct icnss_priv *priv)
 			continue;
 		case ICNSS_SLATE_UP:
 			seq_puts(s, "ICNSS SLATE UP");
+			continue;
+		case ICNSS_LOW_POWER:
+			seq_puts(s, "ICNSS LOW POWER");
 		}
 
 		seq_printf(s, "UNKNOWN-%d", i);