btrfs-progs: add initramfs-tools files, missed in previous.

srcpkgs/btrfs-progs/files/btrfs.initramfs-hook

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+PREREQ=""
+
+prereqs()
+{
+	echo "$PREREQ"
+}
+
+case $1 in
+# get pre-requisites
+prereqs)
+	prereqs
+	exit 0
+	;;
+esac
+
+. /usr/share/initramfs-tools/hook-functions
+
+if [ -x /usr/bin/btrfs ]; then
+	force_load btrfs
+	copy_exec /usr/bin/btrfs sbin
+fi
+
+exit 0

srcpkgs/btrfs-progs/files/btrfs.initramfs-local-top

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+PREREQS=""
+prereqs()
+{
+	echo $PREREQS
+}
+
+case $1 in
+# get pre-requisites
+prereqs)
+	prereqs
+	exit 0
+	;;
+esac
+
+# Activate btrfs multi-volumes.
+. /scripts/functions
+
+_log_msg "Activating btrfs multi-volumes..."
+/sbin/btrfs device scan