checkpatch: recognize only specific tags when ending commit text

There are some very frequently used tags that checkpatch can look
for as an ending to the commit text rather than using a pattern,
which can generate false positives in the "no commit text" rule.

Change-Id: I5b4400017b8273bcd9f5a59b3e28965c0062bef4
Signed-off-by: Steve Muckle <smuckle@codeaurora.org>
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>

scripts/checkpatch.pl

@@ -2131,7 +2131,10 @@ sub process {
 					     "commit text line over " .
 					     SHORTTEXT_LIMIT .
 					     " characters\n" . $herecurr);
-				} elsif ($line=~/^\s*[\x21-\x39\x3b-\x7e]+:/) {
+				} elsif ($line=~/^\s*change-id:/i ||
+					 $line=~/^\s*signed-off-by:/i ||
+					 $line=~/^\s*crs-fixed:/i ||
+					 $line=~/^\s*acked-by:/i) {
 					# this is a tag, there must be commit
 					# text by now
 					if ($commit_text_present == 0) {