radeonsi/uvd: set bo_size in si_video_buffer_create

Fixes memcpy crashes or gpu lockups depending on the hardware.
For example crashes were reported for KAVERI and RYZEN, but gpu
lockups were reported for CAPE VERDE.

Reproducible with gstreamer-vaapi 's vaapih264dec and vaapipostproc.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=111236
Signed-off-by: Julien Isorce <jisorce@oblong.com>
Signed-off-by: Michel Dänzer <mdaenzer@redhat.com>
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