Convert CONFIG_CMD_ASKENV et al to Kconfig

This converts the following to Kconfig:
   CONFIG_CMD_ASKENV
   CONFIG_CMD_BMP
   CONFIG_CMD_BOOTD
   CONFIG_CMD_CACHE
   CONFIG_CMD_CRC32
   CONFIG_CMD_DHCP
   CONFIG_CMD_ENV
   CONFIG_CMD_EXPORTENV
   CONFIG_CMD_EXT2
   CONFIG_CMD_EXT4
   CONFIG_CMD_FLASH
   CONFIG_CMD_FS_GENERIC
   CONFIG_CMD_FUSE
   CONFIG_CMD_GPIO
   CONFIG_CMD_GPT
   CONFIG_CMD_GREPENV
   CONFIG_CMD_I2C
   CONFIG_CMD_IMLS
   CONFIG_CMD_IMPORTENV
   CONFIG_CMD_LOADB
   CONFIG_CMD_LOADS
   CONFIG_CMD_MEMINFO
   CONFIG_CMD_MII
   CONFIG_CMD_MTDPARTS
   CONFIG_CMD_NAND
   CONFIG_CMD_NAND_TRIMFFS
   CONFIG_CMD_NFS
   CONFIG_CMD_PCA953X
   CONFIG_CMD_PCA953X_INFO
   CONFIG_CMD_PCI
   CONFIG_CMD_PING
   CONFIG_CMD_READ
   CONFIG_CMD_SF
   CONFIG_CMD_SPI
   CONFIG_CMD_SPL
   CONFIG_CMD_SPL_WRITE_SIZE
   CONFIG_CMD_TIME
   CONFIG_CMD_TRACE
   CONFIG_CMD_UBI
   CONFIG_CMD_UBIFS
   CONFIG_CMD_UNZIP
   CONFIG_FS_EXT4

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ds109_defconfig b/configs/ds109_defconfig
index 89ed5eb..12419ac 100644
--- a/configs/ds109_defconfig
+++ b/configs/ds109_defconfig
@@ -18,6 +18,7 @@
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_PING=y
+CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_ISO_PARTITION=y
 CONFIG_OF_CONTROL=y
@@ -46,4 +47,3 @@
 CONFIG_USB=y
 CONFIG_DM_USB=y
 CONFIG_USB_EHCI_HCD=y
-CONFIG_FS_EXT4=y