checkpatch: Use upstream commit text length checks

Upstream has merged a few commit text length checks
that make our own checks redundant. Furthermore,
upstream also has a newer exception list (such as
allowing Fixes: lines to be >75 characters) that
we should take advantage of.

Change-Id: I894482c1a4182ad71146d5d433610d4cb210cb1d
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index f93db0e..a0d45ef 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2438,15 +2438,6 @@
 						     $herecurr);
 					}
 					$shorttext = AFTER_SHORTTEXT;
-				} elsif (length($line) > (SHORTTEXT_LIMIT +
-							  $shorttext_exspc)
-					 && $line !~ /^:([0-7]{6}\s){2}
-						      ([[:xdigit:]]+\.*
-						       \s){2}\w+\s\w+/xms) {
-					WARN("LONG_COMMIT_TEXT",
-					     "commit text line over " .
-					     SHORTTEXT_LIMIT .
-					     " characters\n" . $herecurr);
 				} elsif ($line=~/^\s*change-id:/i ||
 					 $line=~/^\s*signed-off-by:/i ||
 					 $line=~/^\s*crs-fixed:/i ||