drm/amd/display: Set cursor attributes before position

HWSS set_cursor_attributes copies the stream's cursor attributes
to the hubp cursor attributes. set_cursor_position might attempt
to program the cursor attributes but will program them wrong if
they're not set correctly. We need to call HWSS set_cursor_attributes
first to ensure hubp has the right attributes to be programmed.

Reviewed-by: Agustin Gutierrez <agustin.gutierrez@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>