tcl/board: Move SiFive configs into vendor directory

Move the configuration files into a dedicated vendor folder as required
by the developer guidelines.

Change-Id: I5bf048f2d8d0fccbcfe40e0a0e7b30dfbab192d1
Signed-off-by: Marc Schink <dev@zapb.de>
Reviewed-on: https://review.openocd.org/c/openocd/+/9082
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins

tcl/board/sifive/e31-arty.cfg

@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+#
+# Be sure you include the speed and interface before this file
+# Example:
+# -c "adapter speed 5000" -f "interface/ftdi/olimex-arm-usb-tiny-h.cfg" -f "board/sifive/e31-arty.cfg"
+
+set _CHIPNAME riscv
+jtag newtap $_CHIPNAME cpu -irlen 5 -expected-id 0x20000001
+
+set _TARGETNAME $_CHIPNAME.cpu
+
+target create $_TARGETNAME.0 riscv -chain-position $_TARGETNAME
+$_TARGETNAME.0 configure -work-area-phys 0x80000000 -work-area-size 10000 -work-area-backup 1
+
+flash bank spi0 fespi 0x40000000 0 0 0 $_TARGETNAME.0 0x20004000
+init
+if {[ info exists pulse_srst]} {
+  ftdi set_signal nSRST 0
+  ftdi set_signal nSRST z
+}
+halt
+flash protect 0 64 last off
+echo "Ready for Remote Connections"