drm/i915: Move ddi shared dpll code to intel_dpll_mgr.c

No functional changes.

Signed-off-by: Ander Conselvan de Oliveira <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/1457451987-17466-3-git-send-email-ander.conselvan.de.oliveira@intel.com

Author: Ander Conselvan de Oliveira