nb/amd/agesa: define DDR3_SPD_SIZE as a common value

Move a size of DDR3 SPD memory (always 256 bytes) to a common define.

Signed-off-by: Mike Banon <mikebdp2@gmail.com>
Change-Id: I80c89ff6e44526e1d75b0e933b21801ed17c98c0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/44498
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/vendorcode/amd/agesa/f14/AGESA.h

@@ -1158,9 +1158,10 @@ typedef enum {
 ///
 /// SPD Data for each DIMM.
 ///
+#define DDR3_SPD_SIZE 256
 typedef struct _SPD_DEF_STRUCT {
   IN BOOLEAN DimmPresent;       ///< Indicates that the DIMM is present and Data is valid
-  IN UINT8 Data[256];           ///< Buffer for 256 Bytes of SPD data from DIMM
+  IN UINT8 Data[DDR3_SPD_SIZE]; ///< Buffer for 256 Bytes of SPD data from DIMM
 } SPD_DEF_STRUCT;
 
 ///

src/vendorcode/amd/agesa/f15tn/AGESA.h

@@ -1546,9 +1546,10 @@ typedef enum {
 ///
 /// SPD Data for each DIMM.
 ///
+#define DDR3_SPD_SIZE 256
 typedef struct _SPD_DEF_STRUCT {
   IN BOOLEAN DimmPresent;       ///< Indicates that the DIMM is present and Data is valid
-  IN UINT8 Data[256];           ///< Buffer for 256 Bytes of SPD data from DIMM
+  IN UINT8 Data[DDR3_SPD_SIZE]; ///< Buffer for 256 Bytes of SPD data from DIMM
 } SPD_DEF_STRUCT;
 
 ///

src/vendorcode/amd/agesa/f16kb/AGESA.h

@@ -1621,9 +1621,10 @@ typedef enum {
 ///
 /// SPD Data for each DIMM.
 ///
+#define DDR3_SPD_SIZE 256
 typedef struct _SPD_DEF_STRUCT {
   IN BOOLEAN DimmPresent;       ///< Indicates that the DIMM is present and Data is valid
-  IN UINT8 Data[256];           ///< Buffer for 256 Bytes of SPD data from DIMM
+  IN UINT8 Data[DDR3_SPD_SIZE]; ///< Buffer for 256 Bytes of SPD data from DIMM
 } SPD_DEF_STRUCT;
 
 ///