arm64: mm: handle ARM64_KERNEL_USES_PMD_MAPS in vmemmap_populate()

Directly check ARM64_SWAPPER_USES_SECTION_MAPS to choose base page
or PMD level huge page mapping in vmemmap_populate() to simplify
code a bit.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Link: https://lore.kernel.org/r/20220920014951.196191-1-wangkefeng.wang@huawei.com


Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>