CI: Test for unmigrated CONFIG symbols in board config.h files

Now that all symbols that exist in Kconfig no longer also have boards
setting them  in the board config.h file, add a CI test to catch new
instances of this, and fail.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/.azure-pipelines.yml b/.azure-pipelines.yml
index 8801ff7..670bbc0 100644
--- a/.azure-pipelines.yml
+++ b/.azure-pipelines.yml
@@ -49,6 +49,33 @@
             -j$(sysctl -n hw.logicalcpu)
         displayName: 'Perform tools-only build'
 
+  - job: check_for_migrated_symbols_in_board_header
+    displayName: 'Check for migrated symbols in board header'
+    pool:
+      vmImage: $(ubuntu_vm)
+    container:
+      image: $(ci_runner_image)
+      options: $(container_option)
+    steps:
+      - script: |
+          KSYMLST=`mktemp`
+          KUSEDLST=`mktemp`
+          cat `find . -name "Kconfig*"` | \
+             sed -n -e 's/^\s*config *\([A-Za-z0-9_]*\).*$/CONFIG_\1/p' \
+             -e 's/^\s*menuconfig *\([A-Za-z0-9_]*\).*$/CONFIG_\1/p' \
+             | sort -u > $KSYMLST
+          for CFG in `find include/configs -name "*.h"`; do
+             grep '#define[[:blank:]]CONFIG_' $CFG | \
+                sed -n 's/#define.\(CONFIG_[A-Za-z0-9_]*\).*/\1/p' | \
+                sort -u > ${KUSEDLST} || true
+             NUM=`comm -12 --total --output-delimiter=, ${KSYMLST} ${KUSEDLST} | \
+                cut -d , -f 3`
+             if [[ $NUM -ne 0 ]]; then
+                echo "Unmigrated symbols found in $CFG"
+                exit 1
+             fi
+          done
+
   - job: cppcheck
     displayName: 'Static code analysis with cppcheck'
     pool: