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SGI-Clark.Helios platform is similar to SGI-Clark.Ares platform.
The difference between these two platforms is the CPU type and
the number of CPUs. Add the base support for SGI-Clark.Helios platform.

Change-Id: I2b04cb3fb953907848b4fab016e3648899ca4256
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>

Add two new functions 'plat_arm_sgi_get_platform_id' and
'plat_arm_sgi_get_config_id' which will be implemented by all the
SGI platforms. These functions can be used to determine the part
number and configuration id of the SGI platforms.

In BL2, these functions are used to populate the 'system-id' node.
In BL31, these functions are used to populate the 'sgi_plat_info_t'
structure with the part number and configuration id of the platform.

Change-Id: I3bacda933527724a3b4074ad4ed5b53a81ea4689
Signed-off-by: Chandni Cherukuri <chandni.cherukuri@arm.com>