tcl/board: Add AM642 EVM basic support

Add basic connection details with AM642 EVM

Change-Id: I95dcf6afadb61bfd8456b79274eae863b834167d
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-on: http://openocd.zylin.com/5952
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Vignesh Raghavendra
Tested-by: jenkins

tcl/board/ti_am642evm.cfg

@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (C) 2019-2021 Texas Instruments Incorporated - http://www.ti.com/
+#
+# Texas Instruments AM642 EVM
+#
+
+# AM642 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 am642
+}
+
+source [find target/ti_k3.cfg]
+
+adapter speed 250