targetcontrol: add image_fstype argument to commands.runqemu

targetcontrol: add image_fstype argument to commands.runqemu

qemu runner picks up first fsimage type from the hard-coded
list of supported types. This makes it impossible to test
particular image type unless it's not ext4(first type in
the hardcoded list of types).

Added image_fstypes argument to commands.runqemu and QemuTarget
__init__ to specify type of the image to run qemu with.

This will be used to pass wic image type to test efi wic images.

(From OE-Core rev: f1f224a2d4d3f2a760632c2254e91a8f94c8814f)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>