The frame width and height is rounded up to 128 and 32 since commit
8daac1c0, so the width, height for initialization should be rounded up to
128 and 32 too because the MSDK VP9 encoder will do some check on width
and height.

Sample pipeline:
gst-launch-1.0 videotestsrc ! \
video/x-raw,width=320,height=240,format=NV12 ! msdkvp9enc ! fakesink