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This patch adds the API `ccn_get_part0_id` to query the PART0 ID from the
PERIPHERAL_ID 0 register in the CCN driver. This ID allows to distinguish
the variant of CCN present on the system and possibly enable dynamic
configuration of the IP based on the variant. Also added an assert in
`ccn_master_to_rn_id_map()` to ensure that the master map bitfield provided
by the platform is within the expected interface id.

Change-Id: I92d2db7bd93a9be8a7fbe72a522cbcba0aba2d0e

This patch adds a device driver which can be used to program the following
aspects of ARM CCN IP:

1. Specify the mapping between ACE/ACELite/ACELite+DVM/CHI master interfaces and
   Request nodes.
2. Add and remove master interfaces from the snoop and dvm
   domains.
3. Place the L3 cache in a given power state.
4. Configuring system adress map and enabling 3 SN striping mode of memory
   controller operation.

Change-Id: I0f665c6a306938e5b66f6a92f8549b529aa8f325