arm64/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE

Enable arm64 platform to use the MHP_MEMMAP_ON_MEMORY feature.

Link: https://lkml.kernel.org/r/20210421102701.25051-9-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/arm64/Kconfig

@@ -316,6 +316,9 @@ config ZONE_DMA32
 	bool "Support DMA32 zone" if EXPERT
 	default y
 
+config ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
+	def_bool y
+
 config SMP
 	def_bool y