drm/i915: Enable and Disable of HDCP2.2

drm/i915: Enable and Disable of HDCP2.2

Considering that HDCP2.2 is more secure than HDCP1.4, When a setup
supports HDCP2.2 and HDCP1.4, HDCP2.2 will be enabled.

When HDCP2.2 enabling fails and HDCP1.4 is supported, HDCP1.4 is
enabled.

This change implements a sequence of enabling and disabling of
HDCP2.2 authentication and HDCP2.2 port encryption.

v2:
  Included few optimization suggestions [Chris Wilson]
  Commit message is updated as per the rebased version.
  intel_wait_for_register is used instead of wait_for. [Chris Wilson]
v3:
  Extra comment added and Style issue fixed [Uma]
v4:
  Rebased as part of patch reordering.
  HDCP2 encryption status is tracked.
  HW state check is moved into WARN_ON [Daniel]
v5:
  Redefined the mei service functions as per comp redesign.
  Merged patches related to hdcp2.2 enabling and disabling [Sean Paul].
  Required shim functionality is defined [Sean Paul]
v6:
  Return values are handles [Uma]
  Realigned the code.
  Check for comp_master is removed.
v7:
  HDCP2.2 is attempted only if mei interface is up.
  Adjust to the new interface
  Avoid bool usage in struct [Tomas]
v8:
  mei_binded status check is removed.
  %s/hdcp2_in_use/hdcp2_encrypted
v9:
  bool is used in struct intel_hdcp. [Daniel]
v10:
  panel is replaced with sink [Uma]
  Mei interface decided the hdcp2_capability.
  WARN_ON if hdcp_enable is called when hdcp state is ENABLED.
  Reviewed-by Uma.

Signed-off-by: Ramalingam C <ramalingam.c@intel.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1550338640-17470-7-git-send-email-ramalingam.c@intel.com