cfg: update Luminary config files

- Update all Luminary config's to use a common target/stellaris.cfg.
 - Add Luminary ek-lm3s6965 config.
 - Increase working area for boards with more ram.

Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>

tcl/target/stellaris.cfg

@@ -18,6 +18,12 @@ if { [info exists CPUTAPID ] } {
    set _CPUTAPID 0x0ba00477
 }
 
+if { [info exists WORKAREASIZE ] } {
+   set _WORKAREASIZE $WORKAREASIZE
+} else {
+   set _WORKAREASIZE 0x2000
+}
+
 jtag newtap $_CHIPNAME cpu -irlen 4 -irmask 0xf \
 	-expected-id $_CPUTAPID -ignore-version
 
@@ -33,7 +39,7 @@ target create $_TARGETNAME cortex_m3 -chain-position $_CHIPNAME.cpu \
 # NOTE:  you may need or want to reconfigure the work area;
 # some parts have just 6K, and you may want to use other
 # addresses (at end of mem not beginning) or back it up.
-$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size 0x2000
+$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE
 
 # JTAG speed ... slow enough to work with a 12 MHz RC oscillator;
 # LM3S parts don't support RTCK