udev-extraconf: blacklist /dev/md

Do not mount /dev/md by default via udev, this resolved a problem
with the sanity test failing due to seeing the error while attempting
to mount /dev/md0

(From OE-Core rev: 07a2825c6f4ad3e5e3970cd1a89233bd795c68cf)

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-core/udev/files/mount.blacklist

@@ -1,3 +1,4 @@
 /dev/loop
 /dev/ram
 /dev/mtdblock
+/dev/md

meta/recipes-core/udev/udev-extraconf_0.0.bb

@@ -3,7 +3,7 @@ DESCRIPTION = "Extra machine specific configuration files for udev, specifically
 LICENSE = "GPLv2"
 LIC_FILES_CHKSUM = "file://${WORKDIR}/COPYING.GPL;md5=751419260aa954499f7abaabaa882bbe"
 
-PR = "r1"
+PR = "r2"
 
 SRC_URI = "file://mount.blacklist \
            file://COPYING.GPL"