powerpc/mpc85xx:Increase binary size for P, B & T series boards.

u-boot binary size for Freescale mpc85xx platforms is 512KB.
This has been reached to upper limit for some of the platforms causig
linker error.

So, Increase the u-boot binary size to 768KB.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
diff --git a/doc/README.b4860qds b/doc/README.b4860qds
index 48ece4b..f8a79db 100644
--- a/doc/README.b4860qds
+++ b/doc/README.b4860qds
@@ -227,16 +227,16 @@
 NOR Flash memory Map on B4860 and B4420QDS
 ------------------------------------------
  Start		 End		Definition			Size
-0xEFF80000	0xEFFFFFFF	u-boot (current bank)		512KB
-0xEFF60000	0xEFF7FFFF	u-boot env (current bank)	128KB
-0xEFF40000	0xEFF5FFFF	FMAN Ucode (current bank)	128KB
+0xEFF40000	0xEFFFFFFF	u-boot (current bank)		768KB
+0xEFF20000	0xEFF3FFFF	u-boot env (current bank)	128KB
+0xEFF00000	0xEFF1FFFF	FMAN Ucode (current bank)	128KB
 0xEF300000	0xEFF3FFFF	rootfs (alternate bank)		12MB + 256KB
 0xEE800000	0xEE8FFFFF	device tree (alternate bank)	1MB
 0xEE020000	0xEE6FFFFF	Linux.uImage (alternate bank)	6MB+896KB
 0xEE000000	0xEE01FFFF	RCW (alternate bank)		128KB
-0xEDF80000	0xEDFFFFFF	u-boot (alternate bank)		512KB
-0xEDF60000	0xEDF7FFFF	u-boot env (alternate bank)	128KB
-0xEDF40000	0xEDF5FFFF	FMAN ucode (alternate bank)	128KB
+0xEDF40000	0xEDFFFFFF	u-boot (alternate bank)		768KB
+0xEDF20000	0xEDF3FFFF	u-boot env (alternate bank)	128KB
+0xEDF00000	0xEDF1FFFF	FMAN ucode (alternate bank)	128KB
 0xED300000	0xEDF3FFFF	rootfs (current bank)		12MB+256MB
 0xEC800000	0xEC8FFFFF	device tree (current bank)	1MB
 0xEC020000	0xEC6FFFFF	Linux.uImage (current bank)	6MB+896KB