tcl: add lattice ECP5 family support

Add support for ECP5 FPGA targets and board based on this chips:
Radiona ULX3S and Lambdaconcept ECPIX-5

Change-Id: I932fc6e2458cda7d63ac21579acddea5b53410bc
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/6112
Tested-by: jenkins
Reviewed-by: Oleksij Rempel <linux@rempel-privat.de>

tcl/board/lambdaconcept_ecpix-5.cfg

@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#
+# LambdaConcept ECPIX-5
+# http://docs.lambdaconcept.com/ecpix-5/
+# Currently there are following board variants:
+# ECPIX-5 45F - LFE5UM5G-45F
+# ECPIX-5 85F - LFE5UM5G-85F
+#
+# This boards have two JTAG interfaces:
+# - CN4, micro USB port connected to FT2232HQ chip:
+#        ADBUS0 TCK
+#        ADBUS1 TDI
+#        ADBUS2 TDO
+#        ADBUS3 TMS
+#        BDBUS0 UART_TXD
+#        BDBUS1 UART_RXD
+#   This interface should be used with following config:
+#        interface/ftdi/lambdaconcept_ecpix-5.cfg
+# - CN3, 6 pin connector
+# See schematics for more details:
+# http://docs.lambdaconcept.com/ecpix-5/_static/resources/SCH_ECPIX-5_R02.PDF
+#
+# No reset lines are implemented. So it is not possible to remote reset the FPGA
+# by using any of this interfaces
+
+source [find interface/ftdi/lambdaconcept_ecpix-5.cfg]
+source [find fpga/lattice_ecp5.cfg]