cfg: add Blizzard class to stellaris.cfg

Change-Id: I2a1320c696b6d9b070e4a927c4cd4d68178af751
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/150
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

tcl/target/stellaris.cfg

@@ -153,11 +153,12 @@ $_TARGETNAME configure -event reset-start {
 	   set device_class [expr (([mrw 0x400fe000] >> 16) & 0xff)]
 	}
 
-	if {$device_class == 0 || $device_class == 1 || $device_class == 3} {
-		# Sandstorm, Fury and DustDevil are able to use NVIC SYSRESETREQ
+	if {$device_class == 0 || $device_class == 1 ||
+		$device_class == 3 || $device_class == 5} {
+		# Sandstorm, Fury, DustDevil and Blizzard are able to use NVIC SYSRESETREQ
 		cortex_m3 reset_config sysresetreq
 	} else {
-		# Tempest and newer default to using NVIC VECTRESET
+		# Tempest and Firestorm default to using NVIC VECTRESET
 		# peripherals will need reseting manually, see proc reset_peripherals
 		cortex_m3 reset_config vectreset