target: add Espressif ESP32-S2 basic support

ESP32-S2 is a single core Xtensa chip.
Not full featured yet. Some of the missing functionality:
-Semihosting
-Flash breakpoints
-Flash loader
-Apptrace
-FreeRTOS

Signed-off-by: Erhan Kurubas <erhan.kurubas@espressif.com>
Change-Id: I2fb32978e801af5aa21616c581691406ad7cd6bb
Reviewed-on: https://review.openocd.org/c/openocd/+/6940
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-by: Ian Thompson <ianst@cadence.com>
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins

tcl/interface/ftdi/esp32s2_kaluga_v1.cfg

@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# Driver for the FT2232H JTAG chip on the Espressif Kaluga-1 ESP32-S2 board
+# (and most other FT2232H and FT232H based boards)
+#
+# JTAG DIP switch (labelled SW5 in the schematic) should be "ON" for lines
+# labelled TCK, TDO, TDI and TWS, to connect the FT2232H to the ESP32-S2.
+#
+
+adapter driver ftdi
+ftdi vid_pid 0x0403 0x6010 0x0403 0x6014
+
+# interface 1 is the uart
+ftdi channel 0
+
+# TCK, TDI, TDO, TMS: ADBUS0-3
+# TRST/SRST: ADBUS5 (unused for now)
+# LEDs: ACBUS3-4 (inverted)
+
+ftdi layout_init 0x0008 0x180b
+ftdi layout_signal LED -ndata 0x0800
+ftdi layout_signal LED2 -ndata 0x1000
+
+# ESP32* series chips do not have a TRST input, and the SRST line is connected
+# to the EN pin.
+# The target code doesn't handle SRST reset properly yet, so this is
+# commented out:
+# ftdi layout_signal nSRST -oe 0x0020
+# reset_config srst_only