drm/i915: Restore HDCP DRM_INFO when with no downstream

The commit below returned earlier than before, but failed to move the
info message when authenticating without downstream devices. This patch
restores the message on authentication success.

Changes in v2:
- s/no downstream devices/no repeater present/ (Ram)

Fixes: 87eb3ec8 ("drm/i915: II stage HDCP auth for repeater only")
Cc: Ramalingam C <ramalingam.c@intel.com>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180130142943.168314-1-seanpaul@chromium.org
Link: https://patchwork.freedesktop.org/patch/msgid/20180130142943.168314-1-seanpaul@chromium.org