drm/i915: use correct power domain for csr loading

Grabbing a runtime pm reference with intel_runtime_pm_get will only
prevent device D3. But dmc firmware is required even earlier (namely
for the skl power well 2).

Hence we need to grab a rpm reference higher up in the hierarchy. For
simplicity just grab the _INIT display power well. That's a bit too
much, but since the firmware loading task should completely fairly
quickly this won't be a real problem really.

Cc: Damien Lespiau <[email protected]>
Cc: Imre Deak <[email protected]>
Cc: Sunil Kamath <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Signed-off-by: Animesh Manna <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Tested-by: Daniel Stone <[email protected]> # SKL
Signed-off-by: Jani Nikula <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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