libva-utils: upgrade 2.20.0 -> 2.20.1

Changelog:
============
-Fix some coverity issues exposed in encode
-Fixed VPP coverity issues

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>