x86: Move acpi_s3.h to a common location

At present this hedaer is only available on x86. To allow sandbox to use
it for testing, move it to a common location.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/arch/x86/lib/fsp/fsp_common.c b/arch/x86/lib/fsp/fsp_common.c
index 6678d75..40ba866 100644
--- a/arch/x86/lib/fsp/fsp_common.c
+++ b/arch/x86/lib/fsp/fsp_common.c
@@ -4,10 +4,10 @@
  */
 
 #include <common.h>
+#include <acpi_s3.h>
 #include <dm.h>
 #include <errno.h>
 #include <rtc.h>
-#include <asm/acpi_s3.h>
 #include <asm/cmos_layout.h>
 #include <asm/early_cmos.h>
 #include <asm/io.h>