x86: fsp: Create a common fsp_support.h header

Many support functions are common between FSP1 and FSP2. Add a new header
to handle this.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
[bmeng: remove forward declarations in fsp_support.h]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
index b73d0cd..ab3e131 100644
--- a/drivers/pci/pci-uclass.c
+++ b/drivers/pci/pci-uclass.c
@@ -12,7 +12,7 @@
 #include <dm/device-internal.h>
 #include <dm/lists.h>
 #if defined(CONFIG_X86) && defined(CONFIG_HAVE_FSP)
-#include <asm/fsp1/fsp_support.h>
+#include <asm/fsp/fsp_support.h>
 #endif
 #include "pci_internal.h"