minor cleanup in customize_evbarm():

keep handling of /etc/rc.conf in one place

distrib/utils/embedded/conf/evbarm.conf

@@ -1,4 +1,4 @@
-# $NetBSD: evbarm.conf,v 1.26 2017/04/12 23:32:11 jmcneill Exp $
+# $NetBSD: evbarm.conf,v 1.27 2017/05/13 10:44:58 hubertf Exp $
 # evbarm shared config
 #
 image=$HOME/${board}.img
@@ -118,13 +118,14 @@ make_fstab_evbarm() {
 }
 
 customize_evbarm() {
-	cp ${release}/etc/rc.conf ${mnt}/etc/rc.conf
 	if $minwrites; then
 		mkdir ${mnt}/etc/postfix
 		(umask 022
 		sed -e 's/fifo/unix/' < ${release}/etc/postfix/master.cf > \
 		    ${mnt}/etc/postfix/master.cf)
 	fi
+	
+	cp ${release}/etc/rc.conf ${mnt}/etc/rc.conf
 	cat >> ${mnt}/etc/rc.conf << EOF
 rc_configured=YES
 hostname=${board}