drm/i915/panelreplay: enable/disable panel replay

TRANS_DP2_CTL register is programmed to enable panel replay from source
and sink is enabled through panel replay dpcd configuration address.

Bspec: 1407940617

v1: Initial version.
v2:
- Use pr_* flags instead psr_* flags. [Jouni]
- Remove intel_dp_is_edp check as edp1.5 also has panel replay. [Jouni]

v3: Cover letter updated and selective fetch condition check is added
before updating its bit in PSR2_MAN_TRK_CTL register. [Jouni]

v4: Selective fetch related PSR2_MAN_TRK_CTL programmming dropped. [Jouni]

v5: Added PSR2_MAN_TRK_CTL programming as needed for Continuous Full
Frame (CFF) update.

v6: Rebased on latest.

Note: Initial plan is to enable panel replay in  full-screen live active
frame update mode. In a incremental approach panel replay will be enabled
in selctive update mode if there is any gap in curent implementation.

Cc: Jouni Högander <[email protected]>
Cc: Arun R Murthy <[email protected]>
Cc: Jani Nikula <[email protected]>
Reviewed-by: Arun R Murthy <[email protected]>
Signed-off-by: Animesh Manna <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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