configs: Re-sync almost all of cmd/Kconfig

This syncs up the current cmd/Kconfig and include/configs/ files with the
only exception being CMD_NAND.  Due to how we have used this historically
we need to take further care here when converting.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/bct-brettl2_defconfig b/configs/bct-brettl2_defconfig
index bd0acfa..c7e223a 100644
--- a/configs/bct-brettl2_defconfig
+++ b/configs/bct-brettl2_defconfig
@@ -1,6 +1,10 @@
 CONFIG_BLACKFIN=y
 CONFIG_TARGET_BCT_BRETTL2=y
 CONFIG_HUSH_PARSER=y
+CONFIG_CMD_I2C=y
 CONFIG_CMD_GPIO=y
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_PING=y
+CONFIG_CMD_DNS=y
 CONFIG_NET_RANDOM_ETHADDR=y