drm/amd/display: Drop amdgpu_display_manager.dal member

[Why]
It's not being used anymore.

[How]
Nuke it
Signed-off-by: Leo Li <sunpeng.li@amd.com>
Reviewed-by: David Francis <David.Francis@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -427,8 +427,6 @@ static int amdgpu_dm_init(struct amdgpu_device *adev)
 
 	init_data.cgs_device = adev->dm.cgs_device;
 
-	adev->dm.dal = NULL;
-
 	init_data.dce_environment = DCE_ENV_PRODUCTION_DRV;
 
 	/*

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

@@ -78,9 +78,7 @@ struct dm_comressor_info {
 	uint64_t gpu_addr;
 };
 
-
 struct amdgpu_display_manager {
-	struct dal *dal;
 	struct dc *dc;
 	struct cgs_device *cgs_device;