ARM: 8865/1: mm: remove unused variables

Fix gcc warnings:

arch/arm/mm/init.c: In function 'mem_init':
arch/arm/mm/init.c:456:13: warning: unused variable 'itcm_end' [-Wunused-variable]
  extern u32 itcm_end;
             ^
arch/arm/mm/init.c:455:13: warning: unused variable 'dtcm_end' [-Wunused-variable]
  extern u32 dtcm_end;
             ^

They are not used any more since
commit 1c31d4e9 ("ARM: 8820/1: mm: Stop printing the virtual memory layout")

Link: https://lkml.org/lkml/2019/5/12/82Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

arch/arm/mm/init.c

@@ -466,12 +466,6 @@ static void __init free_highpages(void)
  */
 void __init mem_init(void)
 {
-#ifdef CONFIG_HAVE_TCM
-	/* These pointers are filled in on TCM detection */
-	extern u32 dtcm_end;
-	extern u32 itcm_end;
-#endif
-
 	set_max_mapnr(pfn_to_page(max_pfn) - mem_map);
 
 	/* this will put all unused low memory onto the freelists */