Enable multiple fs options for Marvell SoC family on OpenRD boards

Signed-off-by: Clint Adams <clint@debian.org>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Cc: Prafulla Wadaskar <prafulla@marvell.com>
Cc: Julian Pidancet <julian.pidancet@citrix.com>