x86/xsaves: Call booting time xsaves and xrstors in setup_init_fpu_buf

setup_init_fpu_buf() calls booting time xsaves and xrstors to save and restore
xstate in xsave area.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1401387164-43416-15-git-send-email-fenghua.yu@intel.com


Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>