arch/arm64,arm: Prepare for !SEPARATE_ROMSTAGE

Prepare platforms for linking romstage code in the bootblock.

Change-Id: Ic20799b4d6e3f62cd05791a2bd275000a12cc83c
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63420
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/soc/nvidia/tegra210/romstage.c

@@ -6,13 +6,14 @@
 #include <console/console.h>
 #include <lib.h>
 #include <program_loading.h>
+#include <romstage_common.h>
 #include <soc/addressmap.h>
 #include <soc/ccplex.h>
 #include <soc/clock.h>
+#include <soc/nvidia/tegra/apbmisc.h>
+#include <soc/romstage.h>
 #include <soc/sdram.h>
 #include <soc/sdram_configs.h>
-#include <soc/romstage.h>
-#include <soc/nvidia/tegra/apbmisc.h>
 #include <symbols.h>
 #include <vendorcode/google/chromeos/chromeos.h>
 
@@ -26,6 +27,11 @@ void romstage(void)
 	console_init();
 	exception_init();
 
+	romstage_main();
+}
+
+void __noreturn romstage_main(void)
+{
 	printk(BIOS_INFO, "T210: romstage here\n");
 
 #if CONFIG(BOOTROM_SDRAM_INIT)