power: reset: remove dead code as part of pmu_alive protection, we added some backward compatibility code for situations where an older version of el3 firmware was in use, which didn't support the priv_reg smc. we are well past that stage now and devices should have updated el3 firmware. so let's remove the backward compat which is dead code now. Bug: 169128860 Signed-off-by: Okash Khawaja <[email protected]> Change-Id: I520746f86a98d74a5b3dab3281704b4811fb8768