powerpc/mpc85xx: SECURE BOOT- Add secure boot target for B4860QDS

Changes:
1. L2 cache is being invalidated by Boot ROM code for e6500 core.
   So removing the invalidation from start.S
2. Clear the LAW and corresponding configuration for CPC. Boot ROM
   code uses it as hosekeeping area.
3. For Secure boot, CPC is configured as SRAM and used as house
   keeping area. This configuration is to be disabled once in uboot.
   Earlier this disabling of CPC as SRAM was happening in cpu_init_r.
   As a result cache invalidation function was getting skipped in
   case CPC is configured as SRAM.This was causing random crashes.

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Signed-off-by: Aneesh Bansal <aneesh.bansal@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
diff --git a/boards.cfg b/boards.cfg
index 4c9a1a4..af7794d 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -744,6 +744,7 @@
 Active  powerpc     mpc85xx        -           freescale       b4860qds            B4420QDS_NAND                        B4860QDS:PPC_B4420,RAMBOOT_PBL,NAND,SYS_TEXT_BASE=0xFFF40000                                                                      -
 Active  powerpc     mpc85xx        -           freescale       b4860qds            B4420QDS_SPIFLASH                    B4860QDS:PPC_B4420,RAMBOOT_PBL,SPIFLASH,SYS_TEXT_BASE=0xFFF40000                                                                  -
 Active  powerpc     mpc85xx        -           freescale       b4860qds            B4860QDS                             B4860QDS:PPC_B4860                                                                                                                -
+Active  powerpc     mpc85xx        -           freescale       b4860qds            B4860QDS_SECURE_BOOT                 B4860QDS:PPC_B4860,SECURE_BOOT                                                                                                    Aneesh Bansal <aneesh.bansal@freescale.com>
 Active  powerpc     mpc85xx        -           freescale       b4860qds            B4860QDS_NAND                        B4860QDS:PPC_B4860,RAMBOOT_PBL,NAND,SYS_TEXT_BASE=0xFFF40000                                                                      -
 Active  powerpc     mpc85xx        -           freescale       b4860qds            B4860QDS_SPIFLASH                    B4860QDS:PPC_B4860,RAMBOOT_PBL,SPIFLASH,SYS_TEXT_BASE=0xFFF40000                                                                  -
 Active  powerpc     mpc85xx        -           freescale       b4860qds            B4860QDS_SRIO_PCIE_BOOT              B4860QDS:PPC_B4860,SRIO_PCIE_BOOT_SLAVE,SYS_TEXT_BASE=0xFFF40000                                                                  -