ARM: exynos_defconfig: Enable options to mount a rootfs via NFS

This patch enables the options to mount a rootfs over NFS and also
support for automatic configuration of IP addresses during boot as
needed by NFS.
Signed-off-by: NJavier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: NKukjin Kim <kgene@kernel.org>

arch/arm/configs/exynos_defconfig

@@ -36,6 +36,10 @@ CONFIG_PACKET=y
 CONFIG_UNIX=y
 CONFIG_NET_KEY=y
 CONFIG_INET=y
+CONFIG_IP_PNP=y
+CONFIG_IP_PNP_DHCP=y
+CONFIG_IP_PNP_BOOTP=y
+CONFIG_IP_PNP_RARP=y
 CONFIG_WIRELESS=y
 CONFIG_CFG80211=y
 CONFIG_MWIFIEX=y
@@ -206,6 +210,8 @@ CONFIG_TMPFS=y
 CONFIG_TMPFS_POSIX_ACL=y
 CONFIG_CRAMFS=y
 CONFIG_ROMFS_FS=y
+CONFIG_NFS_FS=y
+CONFIG_ROOT_NFS=y
 CONFIG_NLS_CODEPAGE_437=y
 CONFIG_NLS_ASCII=y
 CONFIG_NLS_ISO8859_1=y