x86: acpi: Fix build error with certain configuration

When CONFIG_EFI_PARTITION is not set, the following build error is
seen in arch/x86/lib/acpi_s3.c:

  error: expected declaration specifiers or '...' before '*' token
  static void asmlinkage (*acpi_do_wakeup)(void *vector) = (void*)WAKEUP_BASE;

This is actually caused by missing asmlinkage declaration, but with
CONFIG_EFI_PARTITION on, the declaration comes from part.h which
is included from common.h.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>

arch/x86/lib/acpi_s3.c

@@ -8,6 +8,7 @@
 #include <asm/acpi_s3.h>
 #include <asm/acpi_table.h>
 #include <asm/post.h>
+#include <linux/linkage.h>
 
 DECLARE_GLOBAL_DATA_PTR;