DCE-KMD: Remove dce.h include from dce-pm.h

- Remove dce.h include from dce-pm.h to resolve circular
  dependency betweeen dce.h and dce-pm.h

- This is an existing circular dependency but has floated
  up now due to some re-org in DCE-KMD code.

JIRA TDS-16052

Change-Id: I046743cf70f344d87500e7f9d595f8cfe2379446
Signed-off-by: anupamg <anupamg@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3192713
Reviewed-by: Mahesh Kumar <mahkumar@nvidia.com>
Reviewed-by: svcacv <svcacv@nvidia.com>
Reviewed-by: Arun Swain <arswain@nvidia.com>
GVS: buildbot_gerritrpt <buildbot_gerritrpt@nvidia.com>

drivers/platform/tegra/dce/include/dce-pm.h

@@ -6,7 +6,7 @@
 #ifndef DCE_PM_H
 #define DCE_PM_H
 
-#include <dce.h>
+struct tegra_dce;
 
 struct dce_sc7_state {
 	uint32_t hsp_ie;