Powerpc/mpc8536DS: Increase SPI/SD uboot Image size to 768K

u-boot binary size for Freescale mpc8536DS platforms is 512KB.
This has been reached to upper limit of the platforms and causig
linker error. So increase the u-boot binary size to 768KB.
Signed-off-by: NHaijun Zhang <Haijun.Zhang@freescale.com>
Reviewed-by: NYork Sun <yorksun@freescale.com>

include/configs/MPC8536DS.h

@@ -31,13 +31,13 @@
 
 #ifdef CONFIG_SDCARD
 #define CONFIG_RAMBOOT_SDCARD		1
-#define CONFIG_SYS_TEXT_BASE	0xf8f80000
+#define CONFIG_SYS_TEXT_BASE	0xf8f40000
 #define CONFIG_RESET_VECTOR_ADDRESS	0xf8fffffc
 #endif
 
 #ifdef CONFIG_SPIFLASH
 #define CONFIG_RAMBOOT_SPIFLASH		1
-#define CONFIG_SYS_TEXT_BASE	0xf8f80000
+#define CONFIG_SYS_TEXT_BASE	0xf8f40000
 #define CONFIG_RESET_VECTOR_ADDRESS	0xf8fffffc
 #endif