iommu/vt-d: Deduplicate cache_tag_flush_all by reusing flush_range

iommu/vt-d: Deduplicate cache_tag_flush_all by reusing flush_range

The logic in cache_tag_flush_all() to iterate over cache tags and issue
TLB invalidations is largely duplicated in cache_tag_flush_range(), with
the only difference being the range parameters.

Extend cache_tag_flush_range() to handle a full address space flush when
called with start = 0 and end = ULONG_MAX. This allows
cache_tag_flush_all() to simply delegate to cache_tag_flush_range()

Signed-off-by: Ethan Milon <ethan.milon@eviden.com>
Link: https://lore.kernel.org/r/20250708214821.30967-2-ethan.milon@eviden.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20250714045028.958850-12-baolu.lu@linux.intel.com
Signed-off-by: Will Deacon <will@kernel.org>