montblanc: add udev rules for jtag devices

Summary:
Add udev rules to create symlink for JTAG master: user space programs
shall access the JTAG sysfs path using the symlink, because the sysfs
path is changed in the latest linux kernel.

Test Plan:
1) "bitbake montblanc-image" passed.
2) verified /run/devmap/jtag/ASPEED_JTAG was created at bootup time
   successfully:

root@bmc-oob:~# readlink /run/devmap/jtag/ASPEED_JTAG
/sys/devices/platform/ahb/1e6e0000.apb/1e6e4100.jtag
root@bmc-oob:~# ls /run/devmap/jtag/ASPEED_JTAG/
driver                                     of_node                                    tck
driver_override                            power                                      tdi
freq                                       sts                                        tdo
misc                                       subsystem                                  tms
modalias                                   supplier:platform:1e6e2000.syscon:pinctrl  uevent

Reviewed By: Scott8440

Differential Revision: D62366068

fbshipit-source-id: d64ce2062a95a09b6dbcd8385a92542248f81e99

meta-facebook/meta-montblanc/recipes-utils/udev-rules/files/jtag.rules

@@ -0,0 +1 @@
+SUBSYSTEM=="platform", DEVPATH=="/devices/platform/ahb/*/1e6e4100.jtag", RUN+="/bin/mkdir -p /run/devmap/jtag", RUN+="/bin/ln -sf %S%p /run/devmap/jtag/ASPEED_JTAG"

meta-facebook/meta-montblanc/recipes-utils/udev-rules/udev-rules.bbappend

@@ -0,0 +1,30 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This program file is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by the
+# Free Software Foundation; version 2 of the License.
+#
+# This program is distributed in the hope that it will be useful, but WITHOUT
+# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program in a file named COPYING; if not, write to the
+# Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor,
+# Boston, MA 02110-1301 USA
+
+FILESEXTRAPATHS:prepend := "${THISDIR}/files:"
+LOCAL_URI += " \
+    file://jtag.rules \
+    "
+
+do_install:append() {
+    dst=${D}${sysconfdir}/udev/
+    install -d ${dst}/rules.d
+
+    install -m 0644 jtag.rules ${dst}/rules.d/99-jtag.rules
+}
+
+FILES:${PN} += "${sysconfdir}"