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 <vincent.stehle@freescale.com>
Cc: Russell King <linux@arm.linux.org.uk>
[olof: squashed three commits down to one]
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/configs/multi_v7_defconfig

@@ -47,6 +47,8 @@ CONFIG_ARM_APPENDED_DTB=y
 CONFIG_NET=y
 CONFIG_UNIX=y
 CONFIG_INET=y
+CONFIG_IP_PNP=y
+CONFIG_IP_PNP_DHCP=y
 CONFIG_DEVTMPFS=y
 CONFIG_DEVTMPFS_MOUNT=y
 CONFIG_BLK_DEV_SD=y
@@ -75,6 +77,10 @@ CONFIG_SERIAL_OMAP=y
 CONFIG_SERIAL_OMAP_CONSOLE=y
 CONFIG_SERIAL_XILINX_PS_UART=y
 CONFIG_SERIAL_XILINX_PS_UART_CONSOLE=y
+CONFIG_SERIAL_IMX=y
+CONFIG_SERIAL_IMX_CONSOLE=y
+CONFIG_SERIAL_FSL_LPUART=y
+CONFIG_SERIAL_FSL_LPUART_CONSOLE=y
 CONFIG_I2C_DESIGNWARE_PLATFORM=y
 CONFIG_I2C_SIRF=y
 CONFIG_I2C_TEGRA=y
@@ -147,6 +153,10 @@ CONFIG_PWM=y
 CONFIG_PWM_VT8500=y
 CONFIG_EXT4_FS=y
 CONFIG_TMPFS=y
+CONFIG_NFS_FS=y
+CONFIG_NFS_V3_ACL=y
+CONFIG_NFS_V4=y
+CONFIG_ROOT_NFS=y
 CONFIG_PRINTK_TIME=y
 CONFIG_DEBUG_FS=y
 CONFIG_DEBUG_KERNEL=y