tcl/board: Add J721s2 EVM basic support

Add basic connection details with J721s2 EVM.

For further details, see https://www.ti.com/lit/zip/sprr439

Signed-off-by: Nishanth Menon <nm@ti.com>
Change-Id: I68f8818c492ea6e07c14f2da305671c26da801cb
Reviewed-on: https://review.openocd.org/c/openocd/+/6797
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

tcl/board/ti_j721s2evm.cfg

@@ -0,0 +1,25 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2021 Texas Instruments Incorporated - http://www.ti.com/
+#
+# Texas Instruments J721s2 EVM
+# Link(SoM): https://www.ti.com/lit/zip/sprr439
+#
+
+# J721s2 EVM has an xds110 onboard.
+source [find interface/xds110.cfg]
+
+transport select jtag
+
+# default JTAG configuration has only SRST and no TRST
+reset_config srst_only srst_push_pull
+
+# delay after SRST goes inactive
+adapter srst delay 20
+
+if { ![info exists SOC] } {
+	set SOC j721s2
+}
+
+source [find target/ti_k3.cfg]
+
+adapter speed 2500