drm/amdgpu: Clean up errors in vega20_baco.c

Fix the following errors reported by checkpatch:

ERROR: that open brace { should be on the previous line
ERROR: space required before the open parenthesis '('

Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Ran Sun <sunran001@208suo.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>