Remove the unused SMP instruction set feature option.

The SMP option is currently not used in the ART codebase
(and it rots away).
Single CPU systems that run SMP code should be able to deal
with it nicely (otherwise the CPU has some serious problems).

Test: mma test-art-target && mma test-art-host

Change-Id: Ifaab42b29de1062866a0af7525de2f834a4a5a57
19 files changed