ASoC: rt5682: Add a new property to the device tree.

The patch adds a new property to the drice tree for the DMIC clcok driving.
Signed-off-by: Oder Chiou <oder_chiou@realtek.com>
Link: https://lore.kernel.org/r/20201113055400.11242-2-oder_chiou@realtek.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/rt5682.txt

@@ -44,6 +44,8 @@ Optional properties:
 - realtek,dmic-delay-ms : Set the delay time (ms) for the requirement of
   the particular DMIC.
 
+- realtek,dmic-clk-driving-high : Set the high drving of the DMIC clock out.
+
 Pins on the device (for linking into audio routes) for RT5682:
 
   * DMIC L1