Rename ipv6_tables.h -> ip6_tables.h

The file is called ip6_tables.h upstream, but was checked in as
ipv6_tables.h .

Change-Id: Iec6794d7376510465dd82f259743277010be3c7c
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/android.googlesource.com/platform/bionic/+/962398
Reviewed-by: Vickie Cheng <vickiecheng@google.com>
diff --git a/libc/kernel/uapi/linux/netfilter_ipv6/ipv6_tables.h b/libc/kernel/uapi/linux/netfilter_ipv6/ip6_tables.h
similarity index 100%
rename from libc/kernel/uapi/linux/netfilter_ipv6/ipv6_tables.h
rename to libc/kernel/uapi/linux/netfilter_ipv6/ip6_tables.h