anv: fix companion command buffer initialization
What does this MR do and why?
anv: fix companion command buffer initialization
Currently the command buffer is completely empty, which is not good.
There are a few of things that should be programmed, but we've
probably been okay due to the default engine initialization.
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Fixes: edcde0679c ("anv: Add helper to create companion RCS command buffer")