arm64: Kconfig: drop superfluous "select SPARSEMEM_VMEMMAP"

arm64: Kconfig: drop superfluous "select SPARSEMEM_VMEMMAP"

Now handled by the core automatically once SPARSEMEM_VMEMMAP_ENABLE is
selected.

Link: https://lkml.kernel.org/r/20250901150359.867252-3-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>