runqemu: accept vmtypes and wictypes for rootfs paths extensions

runqemu: accept vmtypes and wictypes for rootfs paths extensions

When using a .wic.zst image, its fstype is detected by default as
".zst" which prevent booting correctly.

Fix this by adding wictypes (and vmtypes while at it) to the list of
known fstypes. After this fix, the initial fstype is correctly ".wic.zst".

Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>