drm/i915/xe2lpd: Update bxt_sanitize_cdclk()

With Xe2_LPD, there were changes to the way CDCLK_CTL must be
programmed. Those were reflected on _bxt_set_cdclk() with commit
3d3696c0fed1 ("drm/i915/lnl: Start using CDCLK through PLL"), but
bxt_sanitize_cdclk() was left out.

This was causing some issues when loading the driver with a pre-existing
active display configuration: the driver would mistakenly take the
current value of CDCLK_CTL as wrong and the sanitization would be
triggered.

In a scenario where the display was already configured with a high
CDCLKC and had plane(s) enabled, FIFO underrun errors were reported,
because the current sanitization code selects the minimum possible
CDCLK.

Fix that by updating bxt_sanitize_cdclk() to match the changes made in
_bxt_set_cdclk(). Ideally, we would have a common function to derive the
value for CDCLK_CTL, but that can be done in a future change.

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240105140538.183553-2-gustavo.sousa@intel.com

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