mm: remove the unused ARCH_HAS_HMM_DEVICE Kconfig option

Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NJason Gunthorpe <jgg@mellanox.com>
Reviewed-by: NDan Williams <dan.j.williams@intel.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>

mm/Kconfig

@@ -675,16 +675,6 @@ config ARCH_HAS_HMM_MIRROR
 	depends on (X86_64 || PPC64)
 	depends on MMU && 64BIT
 
-config ARCH_HAS_HMM_DEVICE
-	bool
-	default y
-	depends on (X86_64 || PPC64)
-	depends on MEMORY_HOTPLUG
-	depends on MEMORY_HOTREMOVE
-	depends on SPARSEMEM_VMEMMAP
-	depends on ARCH_HAS_ZONE_DEVICE
-	select XARRAY_MULTI
-
 config ARCH_HAS_HMM
 	bool
 	default y