x86: Move acpi_s3.h to include/acpi/

This header relates to ACPI and we are about to add some more ACPI
headers. Move this one into a new directory so they are together.

The header inclusion in pci_rom.c is not specific to x86 anymore, so drop
the #ifdef CONFIG_X86.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/sysreset/sysreset_x86.c b/drivers/sysreset/sysreset_x86.c
index 8e2d1ea..bc91143 100644
--- a/drivers/sysreset/sysreset_x86.c
+++ b/drivers/sysreset/sysreset_x86.c
@@ -6,11 +6,11 @@
  */
 
 #include <common.h>
-#include <acpi_s3.h>
 #include <dm.h>
 #include <efi_loader.h>
 #include <pch.h>
 #include <sysreset.h>
+#include <acpi/acpi_s3.h>
 #include <asm/io.h>
 #include <asm/processor.h>