remove SSE check at runtime if it's supported at compile-time

SSE2 is a hardware feature supported by atom-based platform.
So it's unnecessary to do runtime check. This will get 2%-3%
benefit for some SKIA-intensive workloads.

Change-Id: I48fa905b503a7060a647cd38ab55ce7e179ee926
Author: Lei Li <lei.l.li@intel.com>
Signed-off-by: Lei Li <lei.l.li@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ: 20472

Conflicts:
	src/opts/opts_check_SSE2.cpp