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/mx53ppd_defconfig b/configs/mx53ppd_defconfig
index 1dca245..4b561ad 100644
--- a/configs/mx53ppd_defconfig
+++ b/configs/mx53ppd_defconfig
@@ -77,3 +77,4 @@
 CONFIG_VIDEO_IPUV3=y
 CONFIG_WATCHDOG_TIMEOUT_MSECS=8000
 CONFIG_IMX_WATCHDOG=y
+CONFIG_BCH=y