tegra210: Include correct include files

Some include files were unnecessary, and program_loading.h
was missing.

Change-Id: Ief3d970af5fbbb6b79da06ba3ea1d8613bfc314f
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/10749
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Tested-by: build bot (Jenkins)

src/soc/nvidia/tegra210/verstage.c

@@ -20,11 +20,9 @@
 #include <arch/cache.h>
 #include <arch/exception.h>
 #include <arch/hlt.h>
-#include <arch/stages.h>
-#include <console/console.h>
 #include <soc/verstage.h>
-#include <timestamp.h>
-#include <vendorcode/google/chromeos/chromeos.h>
+#include <console/console.h>
+#include <program_loading.h>
 
 void __attribute__((weak)) verstage_mainboard_init(void)
 {