drm/i915: Initialize HDCP2.2

Add the HDCP2.2 initialization to the existing HDCP1.4 stack.

v2:
  mei interface handle is protected with mutex. [Chris Wilson]
v3:
  Notifiers are used for the mei interface state.
v4:
  Poll for mei client device state
  Error msg for out of mem [Uma]
  Inline req for init function removed [Uma]
v5:
  Rebase as Part of reordering.
  Component is used for the I915 and MEI_HDCP interface [Daniel]
v6:
  HDCP2.2 uses the I915 component master to communicate with mei_hdcp
	- [Daniel]
  Required HDCP2.2 variables defined [Sean Paul]
v7:
  intel_hdcp2.2_init returns void [Uma]
  Realigning the codes.
v8:
  Avoid using bool structure members.
  MEI interface related changes are moved into separate patch.
  Commit msg is updated accordingly.
  intel_hdcp_exit is defined and used from i915_unload
v9:
  Movement of the hdcp_check_link is moved to new patch [Daniel]
  intel_hdcp2_exit is removed as mei_comp will be unbind in i915_unload.
v10:
  bool is used in struct to make coding simpler. [Daniel]
  hdmi hdcp init is placed correctly after encoder attachment.
v11:
  hdcp2_capability check is moved into hdcp.c [Tomas]

Signed-off-by: Ramalingam C <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Reviewed-by: Uma Shankar <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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