Add uint_(least|fast)*_t types
Add uint_(least|fast)*_t types

This commit adds typedefs for signed and unsigned variants of the
_fast and _least integer types.

BUG=None
BRANCH=None
TEST=make buildall -J

Change-Id: Idefc8f9529d22f17af57859be3c25c36a7f8ec25
Reviewed-on: https://chromium-review.googlesource.com/602870
Commit-Ready: Jeff Andersen <77e9dfce80ee5775241df045b40f54f5881f8209@google.com>
Tested-by: Jeff Andersen <77e9dfce80ee5775241df045b40f54f5881f8209@google.com>
Reviewed-by: Vadim Bendebury <5515d6d2d0829cbe0dd0dcf2094aaded06d58514@chromium.org>
Reviewed-by: Shawn N <5259333ce42e3ace6a73988cec7115ed9d3a661a@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec