ci: add SOC_SERIES_ as false positive in check_compliance.py

CONFIG_SOC_SERIES_ is as regex in scripts/utils/board_v1_to_v2.py.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>

scripts/ci/check_compliance.py

@@ -831,6 +831,7 @@ flagged.
         "LOG_BACKEND_MOCK_OUTPUT_SYST", #Referenced in testcase.yaml of log_syst test
         "SEL",
         "SHIFT",
+        "SOC_SERIES_", # Used as regex in scripts/utils/board_v1_to_v2.py
         "SOC_WATCH",  # Issue 13749
         "SOME_BOOL",
         "SOME_INT",