ARM: bcm2835: Enable NFS root support.

This is also present in multi_v7_defconfig, and means that I can test
the pi1 with the 2835 defconfig in my normal environment.
Signed-off-by: Eric Anholt <eric@anholt.net>

arch/arm/configs/bcm2835_defconfig

@@ -43,6 +43,8 @@ CONFIG_NET=y
 CONFIG_PACKET=y
 CONFIG_UNIX=y
 CONFIG_INET=y
+CONFIG_IP_PNP=y
+CONFIG_IP_PNP_DHCP=y
 CONFIG_NETWORK_SECMARK=y
 CONFIG_NETFILTER=y
 CONFIG_CFG80211=y
@@ -122,6 +124,7 @@ CONFIG_TMPFS=y
 CONFIG_TMPFS_POSIX_ACL=y
 # CONFIG_MISC_FILESYSTEMS is not set
 CONFIG_NFS_FS=y
+CONFIG_ROOT_NFS=y
 CONFIG_NFSD=y
 CONFIG_NLS_CODEPAGE_437=y
 CONFIG_NLS_ASCII=y