x86: Find mounts by FS type, not name

The name in mount invocations like

		mount -t debugfs debugfs /sys/kernel/debug

is nothing but convention and cannot be relied upon.

For example, https://www.kernel.org/doc/Documentation/filesystems/debugfs.txt
recommends making the name "none" instead:

		mount -t debugfs none /sys/kernel/debug

and many existing systems use mounts named "none" or otherwise.

Using `mnt_type` instead of `mnt_fsname` allows kexec to work
on such systems.

This fixes another instance of `poweroff` not working on kexec'ed
kernels because the lack of correctly matched mount results in EFI
variables not being read and propagated.

Signed-off-by: Niklas Hambüchen <mail@nh2.me>
Signed-off-by: Simon Horman <horms@verge.net.au>

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