arm64: mm: select CONFIG_ARCH_PROC_KCORE_TEXT

To avoid issues with the /proc/kcore code getting confused about the
kernels block mappings in the VMALLOC region, enable the existing
facility that describes the [_text, _end) interval as a separate
KCORE_TEXT region, which supersedes the KCORE_VMALLOC region that
it intersects with on arm64.
Reported-by: NTan Xiaojun <tanxiaojun@huawei.com>
Tested-by: NTan Xiaojun <tanxiaojun@huawei.com>
Tested-by: NMark Rutland <mark.rutland@arm.com>
Acked-by: NMark Rutland <mark.rutland@arm.com>
Reviewed-by: NLaura Abbott <labbott@redhat.com>
Reviewed-by: NJiri Olsa <jolsa@kernel.org>
Signed-off-by: NArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

arch/arm64/Kconfig

@@ -246,6 +246,9 @@ config PGTABLE_LEVELS
 config ARCH_SUPPORTS_UPROBES
 	def_bool y
 
+config ARCH_PROC_KCORE_TEXT
+	def_bool y
+
 source "init/Kconfig"
 
 source "kernel/Kconfig.freezer"