qcacmn: Extend throttle level to THROTTLE_LEVEL_5

Currently legacy thermal throttle level can support to
THROTTLE_LEVEL_3 at the most. Per new thermal mitigation
requirement, it's needed to add extra implementation
for TX off processing and target shutdown. So extend
throttle level to THROTTLE_LEVEL_5.

Change-Id: I87c583d2828572605ea91a6ac318a58f20054028
CRs-Fixed: 3413666

dp/inc/cdp_txrx_mob_def.h

@@ -177,6 +177,8 @@ enum throttle_level {
 	THROTTLE_LEVEL_1,
 	THROTTLE_LEVEL_2,
 	THROTTLE_LEVEL_3,
+	THROTTLE_LEVEL_4,
+	THROTTLE_LEVEL_5,
 	/* Invalid */
 	THROTTLE_LEVEL_MAX,
 };