GuC error capture blurts some debug messages about empty
register lists for certain register types on engines during
firmware initialization.

These are not errors or warnings, so get rid of them.
Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220507045847.862261-2-alan.previn.teres.alexis@intel.com