Convert CONFIG_NAND_FSL_ELBC et al to Kconfig

This converts the following to Kconfig:
   CONFIG_NAND_FSL_ELBC
   CONFIG_NAND_FSL_IFC

Note that a number of PowerPC platforms had previously enabled
CONFIG_NAND_FSL_ELBC without CONFIG_MTD_RAW_NAND, and now they no longer
enable the option, reducing the size of a few functions.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1043ardb_nand_defconfig b/configs/ls1043ardb_nand_defconfig
index acf9280..a03e3d0 100644
--- a/configs/ls1043ardb_nand_defconfig
+++ b/configs/ls1043ardb_nand_defconfig
@@ -69,6 +69,7 @@
 CONFIG_FLASH_CFI_DRIVER=y
 CONFIG_SYS_FLASH_USE_BUFFER_WRITE=y
 CONFIG_SYS_FLASH_CFI=y
+CONFIG_NAND_FSL_IFC=y
 CONFIG_SYS_NAND_BLOCK_SIZE=0x20000
 CONFIG_SYS_NAND_ONFI_DETECTION=y
 CONFIG_SF_DEFAULT_BUS=1