Remove erroneous or extra spd.h #includers.

Many of the spd.h #includers don't need it,
and wanted to have spd_sdram() declared instead.
Since they didn't get that, some also had open
coded extern declarations of it instead or as well.
Fix it all up by using spd_sdram.h where needed.

Signed-off-by: Jon Loeliger <jdl@freescale.com>

board/sbc8560/sbc8560.c

diff --git a/board/sbc8560/sbc8560.c b/board/sbc8560/sbc8560.c
index 47df884..8df4f3a 100644
--- a/board/sbc8560/sbc8560.c
+++ b/board/sbc8560/sbc8560.c
@@ -27,13 +27,11 @@
  */
 
 
-extern long int spd_sdram (void);
-
 #include <common.h>
 #include <asm/processor.h>
 #include <asm/immap_85xx.h>
 #include <ioports.h>
-#include <spd.h>
+#include <spd_sdram.h>
 #include <miiphy.h>
 
 long int fixed_sdram (void);
@@ -262,7 +260,7 @@
 long int initdram (int board_type)
 {
 	long dram_size = 0;
-	extern long spd_sdram (void);
+
 #if 0
 #if !defined(CONFIG_RAM_AS_FLASH)
 	volatile ccsr_lbc_t *lbc = (void *)(CFG_MPC85xx_LBC_ADDR);