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mpidr_set_aff_inst() is left shifting an int constant and an
unsigned char value to construct an MPIDR. For affinity level 3 a
shift of 32 would result in shifting out of the 32-bit type and
have no effect on the MPIDR.

These values need to be extended to unsigned long before shifting
to ensure correct results for affinity level 3.

Change-Id: I1ef40afea535f14cfd820c347a065a228e8f4536