powerpc/configs/6xx: Drop no longer needed CONFIG_NF_CONNTRACK_PROC_COMPAT

Since commit adf0516845bc ("netfilter: remove ip_conntrack* sysctl
compat code") we no longer need to set CONFIG_NF_CONNTRACK_PROC_COMPAT
in our defconfigs.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/arch/powerpc/configs/ppc6xx_defconfig b/arch/powerpc/configs/ppc6xx_defconfig
index e42ef73..8baa79e 100644
--- a/arch/powerpc/configs/ppc6xx_defconfig
+++ b/arch/powerpc/configs/ppc6xx_defconfig
@@ -193,7 +193,6 @@
 CONFIG_NETFILTER_XT_MATCH_TIME=m
 CONFIG_NETFILTER_XT_MATCH_U32=m
 CONFIG_NF_CONNTRACK_IPV4=m
-# CONFIG_NF_CONNTRACK_PROC_COMPAT is not set
 CONFIG_IP_NF_IPTABLES=m
 CONFIG_IP_NF_MATCH_AH=m
 CONFIG_IP_NF_MATCH_ECN=m