image_types.bbclass: Restore compatibility with previous UBI filesystems
Support for multiple ubi images has broken dozens of machine deployment scripts
in two ways:
Previously, ubi filesystems would be named $IMAGE_NAME as one would expect. The
current version would append "_rootfs" to that name for no reason. Fix it so that
the name for ubi images remains unchanged if there is only one image to build.
Machines would append to IMAGE_CMD_ubi, adding extra image processing of their
own. This is broken now that IMAGE_CMD_ubi became a variable instead of a function.
Make IMAGE_CMD_ubi a function again, this also makes for more logical quotes (I
was surprised to find that " within " would even work).
Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
