The RK3368 has two clusters of 4 cores and it's cluster id starts at
bit 8 of the MPIDR.  To convert from the cluster id (0 or 1) to the
lowest CPU-ID in the respective cluster, we thus need to shift by 6
(i.e. shift by 8 to extract the cluster-id and multiply by 4).

This change is required to ensure the PSCI support can index the
per-cpu entry-address array correctly.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Change-Id: I64a76038f090a85a47067f09f750e96e3946e756