scripts: checkpatch: allow parentheses around operators

Some macros, e.g., FOR_EACH_FIXED_ARG, require a separator argument that
needs to be in parentheses, e.g., (||). This should not trigger a
checkpatch warning.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>

scripts/checkpatch.pl

@@ -4726,6 +4726,13 @@ sub process {
 						$ok = 1;
 					}
 
+					# some macros require a separator
+					# argument to be in parentheses,
+					# e.g. (||).
+					if ($ca =~ /\($/ || $cc =~ /^\)/) {
+						$ok = 1;
+					}
+
 					# messages are ERROR, but ?: are CHK
 					if ($ok == 0) {
 						my $msg_level = \&ERROR;