mmrm: Adding Multimedia Resource Manager(MMRM) driver

Adding Multimedia Resource Manager(MMRM) driver for clk rate
admission control of multimedia clients.

Change-Id: I7109369b254793d1dceaf3a34002ad01d14bc40a

driver/src/mmrm_debug.c

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2020, The Linux Foundation. All rights reserved.
+ */
+#include "mmrm_debug.h"
+
+struct dentry *msm_mmrm_debugfs_init(void)
+{
+	return NULL;
+}
+
+void msm_mmrm_debugfs_deinit(void)
+{
+}
+