x86, cpu: Push TLB detection CPUID check down

Push the max CPUID leaf check into the ->detect_tlb function and remove
general test case from the generic path.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/r/1344272439-29080-3-git-send-email-bp@amd64.org


Acked-by: Alex Shi <alex.shi@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>