ARM: tegra: acer-a500: Improve microphone detection

Use edge-triggered interrupt and set delay to 100ms for microphone hook
detection. This doesn't fix any known problems, but there is a smaller
chance to miss insertion of the microphone now, which previously happened
rarely.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra20-acer-a500-picasso.dts

@@ -420,11 +420,14 @@ wm8903: audio-codec@1a {
 			reg = <0x1a>;
 
 			interrupt-parent = <&gpio>;
-			interrupts = <TEGRA_GPIO(X, 3) IRQ_TYPE_LEVEL_HIGH>;
+			interrupts = <TEGRA_GPIO(X, 3) IRQ_TYPE_EDGE_BOTH>;
 
 			gpio-controller;
 			#gpio-cells = <2>;
 
+			micdet-cfg = <0>;
+			micdet-delay = <100>;
+
 			gpio-cfg = <
 				0x0000 /* MIC_LR_OUT#    GPIO, output, low */
 				0x0000 /* FM2018-enable  GPIO, output, low */