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/pcm030_LOWBOOT_defconfig b/configs/pcm030_LOWBOOT_defconfig
index 6b66d4c..cc8f2a8 100644
--- a/configs/pcm030_LOWBOOT_defconfig
+++ b/configs/pcm030_LOWBOOT_defconfig
@@ -3,5 +3,7 @@
 CONFIG_TARGET_PCM030=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_SYS_EXTRA_OPTIONS="SYS_TEXT_BASE=0xFF000000"
+CONFIG_CMD_I2C=y
 # CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_DHCP=y
 CONFIG_OF_LIBFDT=y