tcl/board: Add Renesas R-Car Salvator-X(S) boards.

Add configuration for the Renesas R-Car Salvator-X
and Renesas R-Car Salvator-XS boards.

Change-Id: I898008f56adb31908d30760f18217583fabf1c51
Signed-off-by: Adam Bass <adam.bass@renesas.com>
Reviewed-on: http://openocd.zylin.com/4670
Tested-by: jenkins
Reviewed-by: Matthias Welwarsky <matthias@welwarsky.de>

tcl/board/renesas_salvator-xs.cfg

@@ -0,0 +1,23 @@
+# Renesas R-Car Gen3 Salvator-X(S) Board Config
+
+# The Salvator-X(S) boards come with either an H3, M3W, or M3N SOC.
+
+echo "\nSalvator-X(S):"
+if { ![info exists SOC] } {
+	set SOC H3
+}
+source [find target/renesas_rcar_gen3.cfg]
+
+reset_config trst_and_srst srst_nogate
+
+proc init_reset {mode} {
+	# Assert both resets: equivalent to a power-on reset
+	jtag_reset 1 1
+
+	# Deassert TRST to begin TAP communication
+	jtag_reset 0 1
+
+	# TAP should now be responsive, validate the scan-chain
+	jtag arp_init
+}
+