msdkdec: force the alignment of width/height to 16 for vp8/vp9
MSDK library requires 16 alignment for vp8/vp9, otherwise a pipeline for vp8/vp9 decoding might fail.
example pipeline:
gst-launch-1.0 filesrc location=vp8_1280x720.webm ! matroskademux !
msdkvp8dec ! fakesink
0:00:00.150565444 10657 0x55c8484036d0 ERROR msdkdec gstmsdkdec.c:1056:gst_msdkdec_handle_frame: DecodeFrameAsync failed (invalid video parameters)
Edited by Haihao Xiang