drm/i915: Map registers before GTT init

This will allow us to read/write registers in GTT init.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
[danvet: Fix up error handling. We really should look into devres for
this stuff ...]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
1 file changed