Convert CONFIG_BCH to Kconfig

This converts the following to Kconfig:
   CONFIG_BCH

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/igep0032_defconfig b/configs/igep0032_defconfig
index 990b749..6e3dcb0 100644
--- a/configs/igep0032_defconfig
+++ b/configs/igep0032_defconfig
@@ -34,5 +34,6 @@
 CONFIG_SYS_NS16550=y
 CONFIG_OMAP3_SPI=y
 CONFIG_FAT_WRITE=y
+CONFIG_BCH=y
 CONFIG_OF_LIBFDT=y
 CONFIG_FDT_FIXUP_PARTITIONS=y