drm/i915/cnp: Display Wa #1179: WaHardHangonHotPlug

"CNL PCH chance of hang when software accesses south display
registers after hotplug is enabled.
Workaround: Program 0xC2000 bits 11:8 = 0xF before enabling
south display hotplug detection."

"Workaround only needs to be applied to pre-production steppings
used in graphics capable SKUs, but it is easier to apply to
everything, and does not hurt."

v2: Moving from clock gating to right before enabling
    SHOTPLUG_CTL as it should be.
v3: Align with SOUTH_CHICKEN1 (DK) and consequently use proper
    spaces on bits definition since other bits around already use
    new style. And now that checkpatch is not noise anymore I also
    fixed the reg read mask to avoid going over 80 chars.

Suggested-by: Ben Widawsky <[email protected]>
Cc: Ben Widawsky <[email protected]>
Cc: Dhinakaran Pandiyan <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Reviewed-by: Dhinakaran Pandiyan <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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