MFC r310744

MFC r310744

sfxge(4): fix efx_ev_qpoll for non-Siena builds

Both Siena and EF10 use the siena_ev_qpoll() implementation, but this
function is not defined in builds without EFSYS_OPT_SIENA.

Remove siena_ev_qpoll and inline it into efx_ev_qpoll to allow it
to be used in non-Siena builds.

Also remove outdated FIXME comment, as EF10 event batching/merging has
been implemented long ago without needing to modify this code.

Submitted by:   Andy Moreton <amoreton at solarflare.com>
Sponsored by:   Solarflare Communications, Inc.

git-svn-id: svn://svn.freebsd.org/base/stable/10@311491 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f