anv: Support wait for heterogeneous list of fences [v3]

anv: Support wait for heterogeneous list of fences [v3]

Handle the case where the set of fences to wait for is not all of the
same type by either waiting for them sequentially (waitAll), or
polling them until the timer has expired (!waitAll). We hope the
latter case is not common.

While the current code makes sure that it always has fences of only
one type, that will not be true when we add WSI fences. Split out this
refactoring to make merging that clearer.

v2: Adopt Jason Ekstrand's coding conventions

    Declare variables at first use, eliminate extra whitespace between
    types and names. Wrap lines to 80 columns.

    Suggested-by: Jason Ekstrand <jason.ekstrand@intel.com>
v2:
    Cast INT64_MAX to uint64_t to make of its use as the maximum
    possible timeout clearly unsigned to the reader.

    Suggested-by: Jason Ekstrand <jason.ekstrand@intel.com>
    Make anv_wait_for_fences with !waitAll check all fences at least
    once, even if the requested timeout has already passed.

Signed-off-by: Keith Packard <keithp@keithp.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>