lint/kconfig_lint: Remove SOUTH_BRIDGE_OPTIONS

SOUTH_BRIDGE_OPTIONS Kconfig symbol is no longer used.

Change-Id: I2380f1ce48afd191755d8b3dcab0b51909f5231f
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79913
Reviewed-by: Nico Huber <nico.h@gmx.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
diff --git a/util/lint/kconfig_lint b/util/lint/kconfig_lint
index 523fa3e..e67aebd 100755
--- a/util/lint/kconfig_lint
+++ b/util/lint/kconfig_lint
@@ -46,7 +46,7 @@
 my @collected_symbols;                #
 my %selected_symbols;                 # list of symbols that are enabled by a select statement
 
-my $exclude_unused = '_SPECIFIC_OPTIONS|SOUTH_BRIDGE_OPTIONS';
+my $exclude_unused = '_SPECIFIC_OPTIONS';
 
 Main();