scripts: coccicheck: filter *.cocci files by MODE

Enhance the coccicheck script to filter *.cocci files based on the
specified MODE (e.g., report, patch). This ensures that only compatible
semantic patch files are executed, preventing errors such as:

"virtual rule report not supported"

This error occurs when a .cocci file does not define a 'virtual <MODE>'
rule, yet is executed in that mode.

For example:

make coccicheck M=drivers/hwtracing/coresight/ MODE=report

In this case, running "secs_to_jiffies.cocci" would trigger the error
because it lacks support for 'report' mode. With this change, such files
are skipped automatically, improving robustness and developer
experience.

Signed-off-by: Songwei Chai <[e-mail]>
Reviewed-by: Julia Lawall <[e-mail]>

scripts/coccicheck

···
 
 if [ "$COCCI" = "" ] ; then
     for f in `find $srctree/scripts/coccinelle/ -name '*.cocci' -type f | sort`; do
-	coccinelle $f
+        if grep -q "virtual[[:space:]]\+$MODE" "$f"; then
+                coccinelle $f
+        else
+                echo "warning: Skipping $f as it does not match mode '$MODE'"
+        fi
     done
 else
     coccinelle $COCCI