Documentation/features: Check ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT

ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT selects ARCH_HAS_ELF_RANDOMIZE,
so add ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT as another Kconfig check
for ELF-ASLR feature, then the refresh script can be used to handle
this case for all archs.

Co-developed-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/1689060720-4628-2-git-send-email-yangtiezhu@loongson.cn