drm/amd: Use `amdgpu_ucode_*` helpers for GMC8

The `amdgpu_ucode_request` helper will ensure that the return code for
missing firmware is -ENODEV so that early_init can fail.

The `amdgpu_ucode_release` helper is for symmetry on unloading.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c

@@ -264,16 +264,10 @@ static int gmc_v8_0_init_microcode(struct amdgpu_device *adev)
 	}
 
 	snprintf(fw_name, sizeof(fw_name), "amdgpu/%s_mc.bin", chip_name);
-	err = request_firmware(&adev->gmc.fw, fw_name, adev->dev);
-	if (err)
-		goto out;
-	err = amdgpu_ucode_validate(adev->gmc.fw);
-
-out:
+	err = amdgpu_ucode_request(adev, &adev->gmc.fw, fw_name);
 	if (err) {
 		pr_err("mc: Failed to load firmware \"%s\"\n", fw_name);
-		release_firmware(adev->gmc.fw);
-		adev->gmc.fw = NULL;
+		amdgpu_ucode_release(&adev->gmc.fw);
 	}
 	return err;
 }
@@ -1200,8 +1194,7 @@ static int gmc_v8_0_sw_fini(void *handle)
 	kfree(adev->gmc.vm_fault_info);
 	amdgpu_gart_table_vram_free(adev);
 	amdgpu_bo_fini(adev);
-	release_firmware(adev->gmc.fw);
-	adev->gmc.fw = NULL;
+	amdgpu_ucode_release(&adev->gmc.fw);
 
 	return 0;
 }