Add some comments, clean up comments over 80 chars per line. And there
is an extra line in comment of CPUID_8000_0008_EBX_WBNOINVD, remove
the extra enter and spaces.

Drop the duplicated definition of cpuid AVX512_VBMI marco and rename it
as CPUID_7_0_ECX_AVX512_VBMI.

Changelog:
v3:
    - split the patch into 2 patches. (Suggested by Stefano Garzarella
      and Eduardo Habkost)
v2:
    - correct the comments over 80 chars per line. (Suggested by
      Philippe Mathieu-Daudé)

Tao Xu (2):
  target/i386: clean up comments over 80 chars per line
  target/i386: drop the duplicated definition of cpuid AVX512_VBMI marco

 target/i386/cpu.c           |   4 +-
 target/i386/cpu.h           | 163 +++++++++++++++++++++++-------------
 target/i386/hvf/x86_cpuid.c |   2 +-
 3 files changed, 109 insertions(+), 60 deletions(-)

-- 
2.20.1