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This patch updates 'plat_my_core_pos' handler to call
'plat_core_pos_from_mpidr' instead of implementing the same logic
at two places.

Change-Id: I1e56adaa10dc2fe3440e5507e0e260d8932e6657
Signed-off-by: Kalyani Chidambaram <kalyanic@nvidia.com>