drm/i915: Use intel_get_pipe_timings() and intel_mode_from_pipe_config() in intel_crt...

drm/i915: Use intel_get_pipe_timings() and intel_mode_from_pipe_config() in intel_crtc_mode_get()

Eliminate the duplicate code for pipe timing readout in
intel_crtc_mode_get() by using the functions we use for the normal state
readout.

v2: Store dotclock in adjusted_mode instead of the final mode

Cc: [email protected]
Cc: Rob Kramer <[email protected]>
Cc: Daniel Vetter <[email protected]>
Signed-off-by: Ville Syrjälä <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Tested-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]