arm/arm64: mmu: Teach virt_to_pte_phys() about block descriptors

The arm and arm64 architectures allow a virtual address to be mapped using
a block descriptor (or huge page, as Linux calls it), and the function
mmu_set_ranges_sect() is made available for a test to do just that. But
virt_to_pte_phys() assumes that all virtual addresses are mapped with page
granularity, which can lead to erroneous addresses being returned in the
case of block mappings.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Andrew Jones <andrew.jones@linux.dev>