rules.h: Add ENV_STRING and use it in console_init()

Move the #ifdef chain to set the stage name to rules.h.

Change-Id: I577ddf2de4ef249a1a4ce627bb55608731a9f5ed
Signed-off-by: Ben Gardner <gardner.ben@gmail.com>
Reviewed-on: http://review.coreboot.org/12479
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/console/init.c

@@ -43,18 +43,6 @@ void console_init(void)
 
 	console_hw_init();
 
-	printk(BIOS_INFO, "\n\ncoreboot-%s%s %s %s starting...\n",
-		      coreboot_version, coreboot_extra_version, coreboot_build,
-#if ENV_BOOTBLOCK
-		      "bootblock"
-#elif ENV_ROMSTAGE
-		      "romstage"
-#elif ENV_RAMSTAGE
-		      "ramstage"
-#elif ENV_VERSTAGE
-		      "verstage"
-#else
-		      "UNKNOWN"
-#endif
-		      );
+	printk(BIOS_INFO, "\n\ncoreboot-%s%s %s " ENV_STRING " starting...\n",
+	       coreboot_version, coreboot_extra_version, coreboot_build);
 }