qcacmn: Restrict debugfs file mode

Disable write permission to qdf mem debugfs entries.

Change-Id: I428f2018018cf8edacdbbb9011ed55a8894511d4
CRs-Fixed: 2047311

qdf/linux/src/qdf_mem.c

@@ -435,7 +435,7 @@ static QDF_STATUS qdf_mem_debug_debugfs_init(void)
 		return QDF_STATUS_E_FAILURE;
 
 	debugfs_create_file("list",
-			    S_IRUSR | S_IWUSR,
+			    S_IRUSR,
 			    qdf_mem_debugfs_root,
 			    NULL,
 			    &fops_qdf_mem_debugfs);
@@ -483,12 +483,12 @@ static QDF_STATUS qdf_mem_debugfs_init(void)
 
 
 	debugfs_create_atomic_t("kmalloc",
-				S_IRUSR | S_IWUSR,
+				S_IRUSR,
 				qdf_mem_debugfs_root,
 				&qdf_mem_stat.kmalloc);
 
 	debugfs_create_atomic_t("dma",
-				S_IRUSR | S_IWUSR,
+				S_IRUSR,
 				qdf_mem_debugfs_root,
 				&qdf_mem_stat.dma);