Added tcl config scripts for SAM3A/X targets and devboard

The SAM3A/X processors that were released thus far is either
a SAM3A/X(4) - 256K, or a SAM3A/X(8) - 512K device.  Thus
the config files are per variant, and not per device.

Signed-off-by: Olivier Schonken <olivier.schonken@gmail.com>

Change-Id: I84d26d044e810eb428b1d6287907ea3bf8364c73
Signed-off-by: Olivier Schonken <olivier.schonken@gmail.com>
Reviewed-on: http://openocd.zylin.com/522
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

tcl/board/atmel_sam3x_ek.cfg

@@ -0,0 +1,3 @@
+source [find target/at91sam3ax_8x.cfg]
+
+reset_config srst_only

tcl/target/at91sam3XXX.cfg

@@ -16,7 +16,14 @@
 # at91sam3s1c
 # at91sam3s1b
 # at91sam3s1a
-
+#
+# at91sam3A4C
+# at91sam3A8C
+# at91sam3X4C
+# at91sam3X4E
+# at91sam3X8C
+# at91sam3X8E
+# at91sam3X8H
 if { [info exists CHIPNAME] } {
    set _CHIPNAME $CHIPNAME
 } else {

tcl/target/at91sam3ax_4x.cfg

@@ -0,0 +1,9 @@
+# common stuff
+source [find target/at91sam3ax_xx.cfg]
+
+# size is automatically "calculated" by probing
+set _FLASHNAME $_CHIPNAME.flash0
+flash bank $_FLASHNAME at91sam3 0x000080000 0 1 1 $_TARGETNAME
+# This is a 256K chip - it has the 2nd bank
+set _FLASHNAME $_CHIPNAME.flash1
+flash bank $_FLASHNAME at91sam3 0x0000A0000 0 1 1 $_TARGETNAME

tcl/target/at91sam3ax_8x.cfg

@@ -0,0 +1,11 @@
+# common stuff
+source [find target/at91sam3ax_xx.cfg]
+
+# size is automatically "calculated" by probing
+set _FLASHNAME $_CHIPNAME.flash0
+flash bank $_FLASHNAME at91sam3 0x000080000 0 1 1 $_TARGETNAME
+# This is a 512K chip - it has the 2nd bank
+set _FLASHNAME $_CHIPNAME.flash1
+flash bank $_FLASHNAME at91sam3 0x0000C0000 0 1 1 $_TARGETNAME
+
+

tcl/target/at91sam3ax_xx.cfg

@@ -0,0 +1,11 @@
+# script for ATMEL sam3, a CORTEX-M3 chip
+#
+# at91sam3A4C
+# at91sam3A8C
+# at91sam3X4C
+# at91sam3X4E
+# at91sam3X8C
+# at91sam3X8E
+# at91sam3X8H
+source [find target/at91sam3XXX.cfg]
+