refactor(spmd): remove spmd_get_context_by_mpidr

spmd_get_context_by_mpidr calls plat_core_pos_by_mpidr defined in
platform's fvp_topology. This involves a lot of intricated inner calls
including access to power controller (taking/releasing a bakery lock).
Remove dependency from this function, and use plat_my_core_pos instead.

Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I8e91858922e339de51056dba8803db74c8fd7420
1 file changed