Update marzen defconfig
* Enable MMC Block device as SDHI hw is now supported.
* Default to NFS root, this is consistent with many other
  shmobile boards
* Enable UNIX which is required by udevd
* Enable SDHI

Other changes are noise due to using make savedefconfig
to create the new defconfig.

Cc: Phil Edworthy <phil.edworthy@renesas.com>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: NSimon Horman <horms@verge.net.au>