powerpc/configs/85xx: Enable CONFIG_DEBUG_KERNEL

This is required for CONFIG_DEBUG_INFO to work.
Signed-off-by: NScott Wood <oss@buserror.net>

arch/powerpc/configs/fsl-emb-nonhw.config

@@ -25,6 +25,7 @@ CONFIG_CRYPTO_SHA256=y
 CONFIG_CRYPTO_SHA512=y
 CONFIG_DEBUG_FS=y
 CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_KERNEL=y
 CONFIG_DEBUG_SHIRQ=y
 CONFIG_DETECT_HUNG_TASK=y
 CONFIG_DEVTMPFS_MOUNT=y