mpc85xx/T1040QDS_D4: Add DDR4 support

T1040QDS_D4 is a variant of T1040QDS, with additional circuit to support
DDR4 memory. Tested with MTA9ASF51272AZ-2G1AYESZG.

Signed-off-by: York Sun <yorksun@freescale.com>
diff --git a/boards.cfg b/boards.cfg
index 730066c..f6837b7 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -942,6 +942,7 @@
 Active  powerpc     mpc85xx        -           freescale       p2041rdb            P2041RDB_SPIFLASH                    P2041RDB:RAMBOOT_PBL,SPIFLASH,SYS_TEXT_BASE=0xFFF40000                                                                            -
 Active  powerpc     mpc85xx        -           freescale       p2041rdb            P2041RDB_SRIO_PCIE_BOOT              P2041RDB:SRIO_PCIE_BOOT_SLAVE,SYS_TEXT_BASE=0xFFF40000                                                                            -
 Active  powerpc     mpc85xx        -           freescale       t1040qds            T1040QDS                             T1040QDS:PPC_T1040                                                                                                                Poonam Aggrwal <poonam.aggrwal@freescale.com>
+Active  powerpc     mpc85xx        -           freescale       t1040qds            T1040QDS_D4                          T1040QDS:PPC_T1040,SYS_FSL_DDR4                                                                                                   Poonam Aggrwal <poonam.aggrwal@freescale.com>
 Active  powerpc     mpc85xx        -           freescale       t1040qds            T1040QDS_SECURE_BOOT                 T1040QDS:PPC_T1040,SECURE_BOOT                                                                                                    Aneesh Bansal <aneesh.bansal@freescale.com>
 Active  powerpc     mpc85xx        -           freescale       t104xrdb            T1040RDB                             T1040RDB:PPC_T1040                                                                                                                Poonam Aggrwal  <poonam.aggrwal@freescale.com>
 Active  powerpc     mpc85xx        -           freescale       t104xrdb            T1040RDB_SECURE_BOOT                 T1040RDB:PPC_T1040,SECURE_BOOT                                                                                                    Aneesh Bansal  <aneesh.bansal@freescale.com>