powerpc/mpc8572ds: Increase u-boot size to 768KB

U-boot image has grown and exceeded the predefined 512KB. Increasing to
768KB to align with other powerpc boards. Tested on MPC8572DS for 32-
and 36-bit targets with NOR flash boot. NAND boot is not covered by
this patch.

Also update board maintainer for these boards.

Signed-off-by: York Sun <yorksun@freescale.com>
Acked-by: Heiko Schocher <hs@denx.de>
diff --git a/boards.cfg b/boards.cfg
index ba54e2f..9fa01a2 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -812,8 +812,8 @@
 Active  powerpc     mpc85xx        -           freescale       mpc8569mds          MPC8569MDS                            -                                                                                                                                 -
 Active  powerpc     mpc85xx        -           freescale       mpc8569mds          MPC8569MDS_ATM                        MPC8569MDS:ATM                                                                                                                    -
 Active  powerpc     mpc85xx        -           freescale       mpc8569mds          MPC8569MDS_NAND                       MPC8569MDS:NAND                                                                                                                   -
-Active  powerpc     mpc85xx        -           freescale       mpc8572ds           MPC8572DS                             -                                                                                                                                 -
-Active  powerpc     mpc85xx        -           freescale       mpc8572ds           MPC8572DS_36BIT                       MPC8572DS:36BIT                                                                                                                   -
+Active  powerpc     mpc85xx        -           freescale       mpc8572ds           MPC8572DS                             -                                                                                                                                 York Sun <yorksun@freescale.com>
+Active  powerpc     mpc85xx        -           freescale       mpc8572ds           MPC8572DS_36BIT                       MPC8572DS:36BIT                                                                                                                   York Sun <yorksun@freescale.com>
 Active  powerpc     mpc85xx        -           freescale       mpc8572ds           MPC8572DS_NAND                        MPC8572DS:NAND                                                                                                                    -
 Active  powerpc     mpc85xx        -           freescale       p1010rdb            P1010RDB-PA_36BIT_NAND                P1010RDB:P1010RDB_PA,36BIT,NAND                                                                                                   -
 Active  powerpc     mpc85xx        -           freescale       p1010rdb            P1010RDB-PA_36BIT_NAND_SECBOOT        P1010RDB:P1010RDB_PA,36BIT,NAND_SECBOOT,SECURE_BOOT                                                                               -