tegra: Define CONFIG_SKIP_LOWLEVEL_INIT for SPL build

Then we can get rid of the #ifdef CONFIG_TEGRA guard in cpu_init_crit.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/include/configs/tegra-common-post.h b/include/configs/tegra-common-post.h
index bf18699..6ed2fde 100644
--- a/include/configs/tegra-common-post.h
+++ b/include/configs/tegra-common-post.h
@@ -157,6 +157,8 @@
 /* overrides for SPL build here */
 #ifdef CONFIG_SPL_BUILD
 
+#define CONFIG_SKIP_LOWLEVEL_INIT
+
 /* remove devicetree support */
 #ifdef CONFIG_OF_CONTROL
 #undef CONFIG_OF_CONTROL