The CpuId function is a wrapper for the intrinsic, or
implemented with inline if unavailable.  It had been
using uint32, but the intrinsics use int, so it was causing
casting and lint warnings.  This change makes the internal
implementation use int.

Casting was also done for xgetbv, and the cast is simply
removed, and is not causing a build error.

MipCpuCaps was doing strlen to check for white space after the
instruction set.  Arm also does this but with a hard coded offset.
This was causing a cast from size_t to int, which produced a lint
warning.  The change removes the white space detect.
In theory the code could be used to detect SSE vs SSE2, and it would
need to check SSE is followed by a space or end of line.  But this
code is only used on Arm and Mips, where there there is one form
of SIMD detected.  e.g. MSA for mips.  If a new instruction set is
added with a similar name, the write space check could be reintroduced.
But its more likely the code can be rewritten to use a better form
of detection by then. Or remove detection and require the instructions

BUG=libyuv:641
TEST=try bots build on all platforms without error and lint is clean

Change-Id: I9f55f8e57bba0f78571bdddbe63b945dea3e8809
Reviewed-on: https://chromium-review.googlesource.com/514524
Commit-Queue: Frank Barchard <fbarchard@google.com>
Reviewed-by: Cheng Wang <wangcheng@google.com>
Reviewed-by: Wan-Teh Chang <wtc@chromium.org>