Some filesystems may want to tweak their output names, rather than using
the fixed "rootfs.foo" scheme. Add a ROOTFS_FOO_IMAGE_NAME variable for
this purpose.
Signed-off-by: Carlos Santos <casantos@datacom.com.br>
[yann.morin.1998@free.fr: fix the patch]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>