drm/i915/cdclk: prefer intel_de_write() over I915_WRITE()

Let's try to not add new ones while we're phasing out I915_READ() and
I915_WRITE().

Fixes: 27a6bc80 ("drm/i915/dg1: Initialize RAWCLK properly")
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201130111601.2817-3-jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_cdclk.c

@@ -2710,8 +2710,8 @@ static int dg1_rawclk(struct drm_i915_private *dev_priv)
 	 * DG1 always uses a 38.4 MHz rawclk.  The bspec tells us
 	 * "Program Numerator=2, Denominator=4, Divider=37 decimal."
 	 */
-	I915_WRITE(PCH_RAWCLK_FREQ,
-		   CNP_RAWCLK_DEN(4) | CNP_RAWCLK_DIV(37) | ICP_RAWCLK_NUM(2));
+	intel_de_write(dev_priv, PCH_RAWCLK_FREQ,
+		       CNP_RAWCLK_DEN(4) | CNP_RAWCLK_DIV(37) | ICP_RAWCLK_NUM(2));
 
 	return 38400;
 }