lint/checkpatch.pl: Pull in coreboot fixes

This pulls in two fixes that were added to coreboot's checkpatch.pl
script:

- commit 82ef8ada (src/commonlib/lz4_wrapper: Correct inline asm for
unaligned 64-bit copy):
modify checkpatch.pl to ignore spaces before opening brackets when
used in inline assembly.

- commit ebef00fa (lint/checkpatch.pl: escape \{ in perl regex to fix
warnings):
Unescaped left brace in regex is deprecated, passed through in regex;

Change-Id: Ia2c712c5b1bb5f67953a9098b5a076e31e3bd8d3
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/16348
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

util/lint/checkpatch.pl

@@ -3836,11 +3836,12 @@ sub process {
 #  1. with a type on the left -- int [] a;
 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
 #  3. inside a curly brace -- = { [0...10] = 5 }
+#  4. in an extended asm instruction -- : [r0]"r"(r0)
 		while ($line =~ /(.*?\s)\[/g) {
 			my ($where, $prefix) = ($-[1], $1);
 			if ($prefix !~ /$Type\s+$/ &&
 			    ($where != 0 || $prefix !~ /^.\s+$/) &&
-			    $prefix !~ /[{,]\s+$/) {
+			    $prefix !~ /[{,:]\s+$/) {
 				if (ERROR("BRACKET_SPACE",
 					  "space prohibited before open square bracket '['\n" . $herecurr) &&
 				    $fix) {
@@ -4709,7 +4710,7 @@ sub process {
 			    $dstat !~ /^do\s*$Constant\s*while\s*$Constant;?$/ &&	# do {...} while (...); // do {...} while (...)
 			    $dstat !~ /^for\s*$Constant$/ &&				# for (...)
 			    $dstat !~ /^for\s*$Constant\s+(?:$Ident|-?$Constant)$/ &&	# for (...) bar()
-			    $dstat !~ /^do\s*{/ &&					# do {...
+			    $dstat !~ /^do\s*\{/ &&					# do {...
 			    $dstat !~ /^\(\{/ &&						# ({...
 			    $ctx !~ /^.\s*#\s*define\s+TRACE_(?:SYSTEM|INCLUDE_FILE|INCLUDE_PATH)\b/)
 			{