icnss2: Don't clear LP on subsystem AFTER SHUTDOWN Event

As per Hibernate Entry (i.e. SUBSYS_BEFORE_SHUTDOWN with flag
crashed is not set) and based on low power supports it set the
state to ICNSS_LOW_POWER.
While processing the SUBSYS_AFTER_SHUTDOWN, its reset the
ICNSS_LOW_POWER state based on previous state already set
state and low power supported.
But before system freeze callback triggered,
SUBSYS_AFTER_SHUTDOWN event received to wlan and due to
which ICNSS_LOW_POWER state is clear and freeze callback failed,
thus its leads to prevent Hibernate freeze on WLAN.
This fix is to provides WLAN entered into Hibernate freeze state
by not clearing ICNSS_LOW_POWER state in SUBSYS_AFTER_SHUTDOWN.

Change-Id: I7b34d54c7ce5314e5092dbe2c0bc65ffe13d014d
CRs-Fixed: 3394501

icnss2/main.c

@@ -2187,9 +2187,6 @@ static int icnss_modem_notifier_nb(struct notifier_block *nb,
 			icnss_msa0_ramdump(priv);
 		}
 
-		if (test_bit(ICNSS_LOW_POWER, &priv->state) &&
-			     priv->low_power_support)
-			clear_bit(ICNSS_LOW_POWER, &priv->state);
 		goto out;
 	default:
 		goto out;