drm/i915/lt_phy: Add verification for lt phy pll dividers

drm/i915/lt_phy: Add verification for lt phy pll dividers

Add verification for lt phy pll dividers during boot. The port clock
is calculated from pll dividers and compared against the requested
port clock value. If there are a difference exceeding +-1 kHz an
drm_warn() is thrown out to indicate possible pll divider mismatch.

v2:
- Move the LT_PHY_PLL_PARAMS -> LT_PHY_PLL_DP/HDMI_PARAMS change
  earlier.
- Use tables[i].name != NULL as a terminating condition.
- Use state vs. params term consistently in intel_c10pll_verify_clock()
  and intel_c20pll_verify_clock().

Signed-off-by: Mika Kahola <mika.kahola@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Link: https://patch.msgid.link/20260119093757.2850233-13-mika.kahola@intel.com