common: Drop part.h from common header

Move this uncommon header out of the common header.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/include/asm/fsp/fsp_api.h b/arch/x86/include/asm/fsp/fsp_api.h
index e9ac86b..4941e2d 100644
--- a/arch/x86/include/asm/fsp/fsp_api.h
+++ b/arch/x86/include/asm/fsp/fsp_api.h
@@ -6,6 +6,8 @@
 #ifndef __ASM_FSP_API_H
 #define __ASM_FSP_API_H
 
+#include <linux/linkage.h>
+
 enum fsp_phase {
 	/* Notification code for post PCI enuermation */
 	INIT_PHASE_PCI	= 0x20,