udev-extraconf: Avoid mounting unknown filesystems

udev-extraconf: Avoid mounting unknown filesystems

Depending on kernel version used, the system can hung when trying to
mount the extended partition (not the logical one) as it is a holder
for other partitions and does not have a filesystem in it.

To avoid this to happen we just mount partitions when these are using
known filesystems so it does not try to mount a partition for an
unsupported filesystem.

Reported-by: Vladan Jovanovic <vladan.jovanovic@gmail.com>
Reported-by: Leonardo Sandoval Gonzalez <b42214@freescale.com>
(From OE-Core rev: 895c9685a7f95dc84786213f945895a504a16254)

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Tested-by: Vladan Jovanovic <vladan.jovanovic@gmail.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>