drm/i915: Expand ggtt_view parameters for debugfs

When dumping the VMA, include the parameters of the different GGTT views
so that we can distinguish them.

v2: Contract output and add MISSING_CASE for any unknown types.
v3: Show both stride and offset for rotated planes.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170112112108.31632-1-chris@chris-wilson.co.uk