Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/c6x/include/asm/pgtable.h b/arch/c6x/include/asm/pgtable.h
index ec4db6d..0b6919c 100644
--- a/arch/c6x/include/asm/pgtable.h
+++ b/arch/c6x/include/asm/pgtable.h
@@ -1,12 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
 /*
  *  Port on Texas Instruments TMS320C6x architecture
  *
  *  Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
  *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License version 2 as
- *  published by the Free Software Foundation.
  */
 #ifndef _ASM_C6X_PGTABLE_H
 #define _ASM_C6X_PGTABLE_H
@@ -63,11 +60,6 @@
 #define swapper_pg_dir ((pgd_t *) 0)
 
 /*
- * No page table caches to initialise
- */
-#define pgtable_cache_init()   do { } while (0)
-
-/*
  * c6x is !MMU, so define the simpliest implementation
  */
 #define pgprot_writecombine pgprot_noncached