tegra: Enable CP15 init

At present CP15 init is disabled on tegra. Use the correct option so that
this init is performed on boot. This enables the instruction cache, for
example, which is critical to the machine running at full speed.
Signed-off-by: NSimon Glass <sjg@chromium.org>

include/configs/tegra-common-post.h

@@ -105,7 +105,7 @@
 /* overrides for SPL build here */
 #ifdef CONFIG_SPL_BUILD
 
-#define CONFIG_SKIP_LOWLEVEL_INIT
+#define CONFIG_SKIP_LOWLEVEL_INIT_ONLY
 
 /* remove I2C support */
 #ifdef CONFIG_SYS_I2C_TEGRA