Move peripheral intialization from BL1 to BL2 in Juno port

[danh-arm]

The fix to #233 moved the TZC-400 initialization from BL1 to BL2. The other peripheral initialization (init_nic400() and init_pcie()) should have also been moved at the same time. These other peripherals are part of the security setup so should be included in the plat_security_setup() function.

Finally, there should be simple NIC-400 and PCI-E drivers added instead of poking the registers directly.

[danh-arm]

Closing this issue since this was effectively done during the ARM platform port reorg. There may be a future need to move some security setup back to BL1 (e.g. to support firmware update) but that can be handled separately.