Add samsung specific changes

drivers/iommu/qcom-io-pgtable-alloc.h

@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2021,2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+#ifndef __QCOM_IO_PGTABLE_ALLOC_H
+#define __QCOM_IO_PGTABLE_ALLOC_H
+
+int qcom_io_pgtable_allocator_register(u32 vmid);
+void qcom_io_pgtable_allocator_unregister(u32 vmid);
+struct page *qcom_io_pgtable_alloc_page(u32 vmid, gfp_t gfp);
+void qcom_io_pgtable_free_page(struct page *page);
+int qcom_io_pgtable_alloc_init(void);
+void qcom_io_pgtable_alloc_exit(void);
+
+#endif /* __QCOM_IO_PGTABLE_ALLOC_H */
+