pld: add support for altera/intel devices

Change-Id: I7977d39c9037ae71139f78c8d381f5f925dc3489
Signed-off-by: Daniel Anselmi <danselmi@gmx.ch>
Reviewed-on: https://review.openocd.org/c/openocd/+/7355
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

tcl/cpld/altera-maxv.cfg

@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+
+# Altera MAXV 5M24OZ/5M570Z CPLD
+# see MAX V Device Handbook
+# Table 6-3: 32-Bit MAX V Device IDCODE
+# 5M40Z 5M80Z 5M160Z 5M240Z: 0x020A50DD
+# 5M570Z:                    0x020A60DD
+# 5M1270Z:                   0x020A30DD
+# 5M1270Z 5M2210Z:           0x020A40DD
+
+if { [info exists CHIPNAME] } {
+	set _CHIPNAME $CHIPNAME
+} else {
+	set _CHIPNAME maxv
+}
+
+jtag newtap $_CHIPNAME tap -irlen 10 \
+  -expected-id 0x020A50DD -expected-id 0x020A60DD \
+  -expected-id 0x020A30DD -expected-id 0x020A40DD