ppc/85xx: Fix inclusion of 83xx immap in 85xx builds

The nand_boot_fsl_elbc.c is shared between 83xx & 85xx however we should
not be including the immap_83xx.h when building 85xx.  We can just get
this all from common.h

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

nand_spl/nand_boot_fsl_elbc.c

@@ -25,7 +25,6 @@
 
 #include <common.h>
 #include <asm/io.h>
-#include <asm/immap_83xx.h>
 #include <asm/fsl_lbc.h>
 #include <linux/mtd/nand.h>