arm: multi_v7_defconfig: add i.MX options and NFS root
arm: multi_v7_defconfig: add i.MX options and NFS root

- Add i.MX serial console support. This gives us the boot messages on
  UART on e.g. the i.MX6Q sabre sd platform.
- Add the necessary config options, to allow booting with NFS root on
  an i.MX6 sabre sd.
- Add Freescale LPUART serial console support. This gives us the boot
  messages on UART on e.g. the Vybrid VF610 Tower board.

Signed-off-by: Vincent Stehlé <54d054b96e74e554ed4c5f2244963ef0a98f708f@freescale.com>
Cc: Russell King <ba324ca7b1c77fc20bb970d5aff6eea9377918a5@arm.linux.org.uk>
[olof: squashed three commits down to one]
Signed-off-by: Olof Johansson <8c69ee23f3f44f8162a64d579c1fa25c2f55298a@lixom.net>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs