swupdate must fail when an image has no handler

If an image type is set and no handler can
install it, do not try to install all other
images and report the whole installation
as failed.

Signed-off-by: Stefano Babic <sbabic@denx.de>
Drop compiler warning when NOCLEANUP is set

Signed-off-by: Stefano Babic <sbabic@denx.de>
Replace RECOVERY with SWUPDATE

Signed-off-by: Stefano Babic <sbabic@denx.de>