drm/amdgpu: create kernel doorbell pages

This patch:
- creates a doorbell page for graphics driver usages.
- adds a few new varlables in adev->doorbell structure to
  keep track of kernel's doorbell-bo.
- removes the adev->doorbell.ptr variable, replaces it with
  kernel-doorbell-bo's cpu address.

V2: - Create doorbell BO directly, no wrappe functions (Alex)
    - no additional doorbell structure (Alex, Christian)
    - Use doorbell_cpu_ptr, remove ioremap (Christian, Alex)
    - Allocate one extra page of doorbells for MES (Alex)

V4: Move MES doorbell base init into MES related patch (Christian)

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian Koenig <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

@@ -1945,6 +1945,13 @@ int amdgpu_ttm_init(struct amdgpu_device *adev)
 		return r;
 	}
 
+	/* Create a boorbell page for kernel usages */
+	r = amdgpu_doorbell_create_kernel_doorbells(adev);
+	if (r) {
+		DRM_ERROR("Failed to initialize kernel doorbells.\n");
+		return r;
+	}
+
 	/* Initialize preemptible memory pool */
 	r = amdgpu_preempt_mgr_init(adev);
 	if (r) {