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/spi.c b/src/southbridge/intel/bd82x6x/spi.c
index 05649fc..4303dd0 100644
--- a/src/southbridge/intel/bd82x6x/spi.c
+++ b/src/southbridge/intel/bd82x6x/spi.c
@@ -29,7 +29,7 @@
 #include <console/console.h>
 #include <device/pci_ids.h>
 
-#include <spi.h>
+#include <spi-generic.h>
 
 #define min(a, b) ((a)<(b)?(a):(b))