Fix error branch in drm_limit_dma_space.
Whitespace.
calculate extended precision as per DS1920/DS1820 data sheets
Revisit gpio and revisit register file mapping. The additional register files
are now mapped behind the origional register file.

The gpio channel GPZ is mapped over I2S0 in the separate audio register file
and were both abusively mapped over I2C0 in the main register file!

While here, delay the gpio bootstrap till on attachment. We could hasten it in
the odroid_machdep.c if needed. Also make the gpio code more resilliant and
allow booting correctly without any GPIO bits defined/available.
Make filehandles on UFS based filesystems use proper 64bit inodes.
32bit restriction noticed by Taylor R Campbell.
Fix >40-bit paddr error branch in i915_gem_object_get_pages_gtt.
Reject 32-bit paddrs on 965.

XXX Doing the check here is wrong; it serves only to report an
earlier problem, which is that there's on way to express constraints
on paddrs to uvm_obj_wirepages.  bus_dmamem_alloc can do this, but it
gives us pages out of thin air, not pages backing a uvm object.  I
was hoping this wouldn't manifest as a real problem, but evidently it
does.
Enabling alignment faults and unaligned access at the same time makes
the former win. LLVM is more aggressive than GCC about using unaligned
access, so it would crash during pmap_init.
Ensure notes are properly padded to 32bit length.
Tweak i915 gen6_gtt_init calculations for clarity.
Fix typo in uvm_km(9): there is no struct vm_map_kernel.
Fix sense of test in last commit, noted by Robert Swindells.