[nrf noup] scripts: ci: check_compliance: Exclude release docs

Adds the NCS release notes folder to the exclusion list for
undefined Kconfigs so that old Kconfigs can be used e.g. for old
release notes, and lwm2m carrier library changelog

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

Author: nordicjm

scripts/ci/check_compliance.py

@@ -1156,6 +1156,8 @@ def check_no_undef_outside_kconfig(self, kconf):
         grep_stdout = git("grep", "--line-number", "-I", "--null",
                           "--perl-regexp", regex, "--", ":!/doc/releases",
                           ":!/doc/security/vulnerabilities.rst",
+                          ":!/doc/nrf/releases_and_maturity",
+                          ":!/doc/nrf/libraries/bin/lwm2m_carrier/CHANGELOG.rst",
                           cwd=GIT_TOP)
 
         # splitlines() supports various line terminators