arm64: kdump: Update the name of crashk_low_res

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I545H8
CVE: NA

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To be consistent with the style of other ARCHs such as x86, the kexec
commit b5a34a20984c ("arm64: support more than one crash kernel regions")
requires all crash regions to be named "Crash kernel". Update the name of
crashk_low_res, so that we can directly use the latest kexec tool without
having to maintain a private version.
Signed-off-by: NZhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

arch/arm64/kernel/setup.c

@@ -273,16 +273,9 @@ static void __init request_standard_resources(void)
 			request_memmap_resources(res);
 
 #ifdef CONFIG_KEXEC_CORE
-		/*
-		 * Userspace will find "Crash kernel" or "Crash kernel (low)"
-		 * region in /proc/iomem.
-		 * In order to distinct from the high region and make no effect
-		 * to the use of existing kexec-tools, rename the low region as
-		 * "Crash kernel (low)".
-		 */
+		/* Userspace will find "Crash kernel" region in /proc/iomem. */
 		if (crashk_low_res.end && crashk_low_res.start >= res->start &&
 				crashk_low_res.end <= res->end) {
-			crashk_low_res.name = "Crash kernel (low)";
 			request_resource(res, &crashk_low_res);
 		}
 		if (crashk_res.end && crashk_res.start >= res->start &&