drm/i915/gen9: csr_init after runtime pm enable

drm/i915/gen9: csr_init after runtime pm enable

Skl is fully dependent on dmc for going to low power state (dc5/dc6).
This requires a trigger from rpm. To ensure the dmc firmware
is available for runtime pm support rpm-reference-count is used
by not releasing the rpm reference if firmware loading is
not completed.

So moved the intel_csr_ucode_init call after runtime pm enable.

Cc: Daniel Vetter <[email protected]>
Cc: Damien Lespiau <[email protected]>
Cc: Imre Deak <[email protected]>
Cc: Sunil Kamath <[email protected]>
Signed-off-by: Animesh Manna <[email protected]>
[imre: moved the call right after power domain init to avoid race with
 the console modesetting]
Signed-off-by: Imre Deak <[email protected]>
Tested-by: Daniel Stone <[email protected]> # SKL
Reviewed-by: A.Sunil Kamath <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]