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/ids8313_defconfig b/configs/ids8313_defconfig
index 8435de1..1237edc 100644
--- a/configs/ids8313_defconfig
+++ b/configs/ids8313_defconfig
@@ -170,6 +170,7 @@
 CONFIG_SYS_FLASH_PROTECTION=y
 CONFIG_SYS_FLASH_CFI=y
 CONFIG_MTD_RAW_NAND=y
+CONFIG_NAND_FSL_ELBC=y
 CONFIG_PHY_ATHEROS=y
 CONFIG_PHY_BROADCOM=y
 CONFIG_PHY_DAVICOM=y