x86, cpu: Clean up formatting in cpufeature.h, remove override

Clean up the formatting in cpufeature.h, and remove an unnecessary
name override.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
LKML-Reference: <tip-*@git.kernel.org>