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/board/freescale/p1010rdb/README.P1010RDB-PB b/board/freescale/p1010rdb/README.P1010RDB-PB
index cf459b3..c5d1419 100644
--- a/board/freescale/p1010rdb/README.P1010RDB-PB
+++ b/board/freescale/p1010rdb/README.P1010RDB-PB
@@ -149,11 +149,11 @@
 1. NOR boot
    => tftp 1000000 u-boot.bin
    For bank0
-   => pro off all;era eff80000 efffffff;cp.b 1000000 eff80000 $filesize
+   => pro off all;era eff40000 efffffff;cp.b 1000000 eff40000 $filesize
    set SW1[8]=0, SW4[1:4]= 1111 and SW3[3:4]= 00, then power on the board
 
    For bank1
-   => pro off all;era eef80000 eeffffff;cp.b 1000000 eef80000 $filesize
+   => pro off all;era eef40000 eeffffff;cp.b 1000000 eef40000 $filesize
    set SW1[8]=1, SW4[1:4]= 1111 and SW3[3:4]= 00, then power on the board
 
 2. NAND boot