drm/amd/powerplay: fix bug that dpm funcs in debugfs/sysfs missing.

BugLink: http://bugs.launchpad.net/bugs/1546572

in dpm module, sysfs init func move to late_init from sw_init.
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

Change-Id: Ice4a73212d8e3106d05f04a27043820ffd32929e
Signed-off-by: Rex Zhu <Rex.Zhu@amd.com>
(cherry picked from commit 7ad4e7f0)
Signed-off-by: Alberto Milone <alberto.milone@canonical.com>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>

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

@@ -120,6 +120,19 @@ static int amdgpu_pp_early_init(void *handle)
 	return ret;
 }
 
+
+static int amdgpu_pp_late_init(void *handle)
+{
+	int ret = 0;
+	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+
+	if (adev->powerplay.ip_funcs->late_init)
+		ret = adev->powerplay.ip_funcs->late_init(
+					adev->powerplay.pp_handle);
+
+	return ret;
+}
+
 static int amdgpu_pp_sw_init(void *handle)
 {
 	int ret = 0;
@@ -281,7 +294,7 @@ static void amdgpu_pp_print_status(void *handle)
 
 const struct amd_ip_funcs amdgpu_pp_ip_funcs = {
 	.early_init = amdgpu_pp_early_init,
-	.late_init = NULL,
+	.late_init = amdgpu_pp_late_init,
 	.sw_init = amdgpu_pp_sw_init,
 	.sw_fini = amdgpu_pp_sw_fini,
 	.hw_init = amdgpu_pp_hw_init,