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-PA b/board/freescale/p1010rdb/README.P1010RDB-PA
index 158a1b3..cde246d 100644
--- a/board/freescale/p1010rdb/README.P1010RDB-PA
+++ b/board/freescale/p1010rdb/README.P1010RDB-PA
@@ -104,9 +104,9 @@
 
 2. Burn u-boot.bin into NOR flash
 	=> tftp $loadaddr $uboot
-	=> protect off eff80000 +$filesize
-	=> erase eff80000 +$filesize
-	=> cp.b $loadaddr eff80000 $filesize
+	=> protect off eff40000 +$filesize
+	=> erase eff40000 +$filesize
+	=> cp.b $loadaddr eff40000 $filesize
 
 3. Check SW4[1:4]= 1111 and SW6[4]=0, then power on.
 
@@ -115,9 +115,9 @@
 ==================
 1. Burn u-boot.bin into alternate NOR bank
 	=> tftp $loadaddr $uboot
-	=> protect off eef80000 +$filesize
-	=> erase eef80000 +$filesize
-	=> cp.b $loadaddr eef80000 $filesize
+	=> protect off eef40000 +$filesize
+	=> erase eef40000 +$filesize
+	=> cp.b $loadaddr eef40000 $filesize
 
 2. Switch to alternate NOR bank
 	=> mw.b ffb00009 1