8544ds PCIE support

PCI1 LAW mapping should use CFG_PCI1_MEM_PHY and not _BASE address.

Enable LBC and ECM errors and clear error registers.

Add tftpflash env var to get uboot from tftp server and flash it.

Add pci/pcie convenience env vars to display register space:
  "run pcie3regs" to see all pcie3 ccsr registers
  "run pcie3cfg" to see all cfg registers
Whitespace cleanup and MPC8544DS.h

Enable CONFIG_INTERRUPTS.

Signed-off-by: Ed Swarthout <Ed.Swarthout@freescale.com>
Acked-by: Andy Fleming <afleming@freescale.com>