target/jffs2: Don't select BR2_PACKAGE_MTD

Mtd-utils on the target are not a requirement to using jffs2.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

target/jffs2/Config.in

@@ -1,7 +1,6 @@
 config BR2_TARGET_ROOTFS_JFFS2
 	bool "jffs2 root filesystem"
 	select BR2_HOST_FAKEROOT
-	select BR2_PACKAGE_MTD
 	help
 	  Build a jffs2 root filesystem