Convert CONFIG_BCH to Kconfig

This converts the following to Kconfig:
   CONFIG_BCH

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ge_bx50v3_defconfig b/configs/ge_bx50v3_defconfig
index 58778e6..d61c238 100644
--- a/configs/ge_bx50v3_defconfig
+++ b/configs/ge_bx50v3_defconfig
@@ -99,4 +99,5 @@
 CONFIG_VIDEO_IPUV3=y
 CONFIG_WATCHDOG_TIMEOUT_MSECS=6000
 CONFIG_IMX_WATCHDOG=y
+CONFIG_BCH=y
 # CONFIG_EFI_LOADER is not set