Some Broadcom MIPS devices require JFFS2 cleanmarkers to be present on the
kernel partition or the bootloader will identify the partition as corrupt and
won't boot the kernel.
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry picked from commit 434df8df549a4d709be9eb19c0d2bd8abb4d4881)
25f6252620