vm: convert HPET mmap to vm_iomap_memory() helper
This is my example conversion of a few existing mmap users. The HPET case is simple, widely available, and easy to test (Clemens Ladisch sent a trivial test-program for it). Test-program-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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