drm/i915: Implement workaround for CDCLK PLL disable/enable

It was reported that we might get a hung and loss of register access in
some cases when CDCLK PLL is disabled and then enabled, while squashing
is enabled.
As a workaround it was proposed by HW team that SW should disable squashing
when CDCLK PLL is being reenabled.

v2: - Added WA number comment(Rodrigo Vivi)

Signed-off-by: Stanislav Lisovskiy <[email protected]>
Reviewed-by: Anusha Srivatsa <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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