i915/gem_pread,gem_pwrite: Exercise using ourselves as the buffer

If we caused a fault on a GEM buffer while in the middle of trying to
write/read into that buffer, we could conceivably deadlock (e.g.
recursing on struct_mutex if we are not careful). Exercise these cases
by supplying a fresh mmap to pread/pwrite in both non-overlapping and
overlapping copies.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>

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