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/tricorder_defconfig b/configs/tricorder_defconfig
index 16e3011..1a07489 100644
--- a/configs/tricorder_defconfig
+++ b/configs/tricorder_defconfig
@@ -36,4 +36,5 @@
 CONFIG_LED_STATUS_CMD=y
 CONFIG_MMC_OMAP_HS=y
 CONFIG_SYS_NS16550=y
+CONFIG_BCH=y
 CONFIG_OF_LIBFDT=y