YB: #6375
Adding support for get_image_fstype() in the MasterImageHardwareTarget and GummibootTarget classes.
(From OE-Core rev: 06ed50a2b8c311e56ac9f1c6f2145bc020d5d500)
Signed-off-by: Corneliu Stoicescu <corneliux.stoicescu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>