arch/mips/configs/*_defconfig cleanup

Drop CONFIG_IP_NF_TARGET_CLUSTERIP from any remaining mips defconfigs as it
was removed in commit 9db5d918 ("netfilter: ip_tables: remove clusterip
target").

Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>