netfilter: layer7: move xt_layer7.h to uapi

this is needed to install this as userspace header for iptables compile.

Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>

diff --git a/include/linux/netfilter/xt_layer7.h b/include/uapi/linux/netfilter/xt_layer7.h
similarity index 100%
rename from include/linux/netfilter/xt_layer7.h
rename to include/uapi/linux/netfilter/xt_layer7.h