boards: enable support for Atmel SAM DAC driver

Enable support for Atmel SAM DAC driver on the following boards:
- sam_e70_xplained
- sam_e70b_xplained
- sam_v71_xult
- sam_v71b_xult

Signed-off-by: Piotr Mienkowski <[email protected]>

Author: mnkp

boards/arm/sam_e70_xplained/sam_e70_xplained-common.dtsi

@@ -57,6 +57,10 @@
 	status = "okay";
 };
 
+&dacc {
+	status = "okay";
+};
+
 &twihs0 {
 	status = "okay";
 };

boards/arm/sam_v71_xult/sam_v71_xult-common.dtsi

@@ -156,6 +156,10 @@
 	status = "okay";
 };
 
+&dacc {
+	status = "okay";
+};
+
 &twihs0 {
 	status = "okay";
 };