spi.h: Rename the spi.h to spi-generic.h

Since there are and will be other files in nb/sb folders, we change
the general spi.h to a file name which is not easy to be duplicated.

Change-Id: I6548a81206caa608369be044747bde31e2b08d1a
Signed-off-by: Zheng Bao <zheng.bao@amd.com>
Signed-off-by: zbao <fishbaozi@gmail.com>
Reviewed-on: http://review.coreboot.org/2309
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/src/southbridge/intel/bd82x6x/finalize.c b/src/southbridge/intel/bd82x6x/finalize.c
index 4a4f021..f627972 100644
--- a/src/southbridge/intel/bd82x6x/finalize.c
+++ b/src/southbridge/intel/bd82x6x/finalize.c
@@ -23,7 +23,7 @@
 #include <console/post_codes.h>
 #include <northbridge/intel/sandybridge/pcie_config.c>
 #include "pch.h"
-#include "spi.h"
+#include <spi-generic.h>
 
 void intel_pch_finalize_smm(void)
 {