alpha: select ARCH_HAS_DEBUG_VM_PGTABLE

CONFIG_DEBUG_VM_PGTABLE runs a boot-time self test over the page table
helpers: the protection bit accessors, pte_modify(), the swap entry
encoding including the exclusive marker, and, where the architecture
supports them, the huge page helpers.  Alpha implements everything the
test needs for a three-level page table without huge page support.

Also mark Alpha as "ok" in the debug-vm-pgtable feature matrix.

Assisted-by: Claude:claude-opus-5
Signed-off-by: Matt Turner <mattst88@gmail.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Reviewed-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://lore.kernel.org/r/20260905-arch-kconfig-options-v2-v2-14-83e8245761a2@gmail.com
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>

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