qcacld-3.0: Fix typo "platfrom"

Replace typo "platfrom" with correct spelling "platform".

Change-Id: If155514d72d70ec326985b1ddff066f2fa3367c2
CRs-Fixed: 2238297

core/hdd/src/wlan_hdd_driver_ops.c

@@ -579,7 +579,7 @@ static void wlan_hdd_shutdown(void)
  * wlan_hdd_crash_shutdown() - wlan_hdd_crash_shutdown
  *
  * HDD crash shutdown funtion: This function is called by
- * platfrom driver's crash shutdown routine
+ * platform driver's crash shutdown routine
  *
  * Return: void
  */