drm/i915: fix misalignment in HDCP register def

This patch aligns all definitions of hdcp registers and their bits.

v2:
  No changes. Added reviewed-by tag.

v3:
 No change.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1517609350-10698-9-git-send-email-ramalingam.c@intel.com