[Bug 766050] Add Low power, High performance h264 encoder support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766050

--- Comment #2 from sreerenj <bsreerenj at gmail.com> ---
Simple profiling:

time gst-launch-1.0 videotestsrc num-buffers=1200 ! video/x-raw, format=NV12,
width=3840, height=2160, framerate=60/1 ! vaapih264enc low-power-enc=FALSE !
filesink location=sample_4k.264
real    0m50.017s
user    0m25.148s
sys    0m0.964s


time gst-launch-1.0 videotestsrc num-buffers=1200 ! video/x-raw, format=NV12,
width=3840, height=2160, framerate=60/1 ! vaapih264enc low-power-enc=TRUE !
filesink location=sample_4k_lp.264
real    0m28.445s
user    0m15.924s
sys    0m0.832s

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