cfg: change default stellaris working area

This sets the default stellaris working area to 2k rather than
the current 8k. 2K is the smallest RAM size in the stellaris family.

Change-Id: I1407f758eb0926cc094b824a6d25199b313c45de
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/458
Tested-by: jenkins

tcl/target/stellaris.cfg

@@ -47,8 +47,8 @@ swj_newdap $_CHIPNAME cpu -irlen 4 -irmask 0xf \
 if { [info exists WORKAREASIZE] } {
    set _WORKAREASIZE $WORKAREASIZE
 } else {
-   # default to 8K working area
-   set _WORKAREASIZE 0x2000
+   # default to 2K working area
+   set _WORKAREASIZE 0x800
 }
 
 set _TARGETNAME $_CHIPNAME.cpu
@@ -133,7 +133,7 @@ proc reset_peripherals {family} {
 $_TARGETNAME configure -event reset-start {
 	adapter_khz 500
 
-	#	
+	#
 	# When nRST is asserted on most Stellaris devices, it clears some of
 	# the debug state.  The ARMv7M and Cortex-M3 TRMs say that's wrong;
 	# and OpenOCD depends on those TRMs.  So we won't use SRST on those