boards: arm: nucleo_c031c6: Enable dma and dmamux

Enable dma and dmamux in dts and update documentation
to include dma support.

Signed-off-by: Benjamin Björnsson <benjamin.bjornsson@gmail.com>
diff --git a/boards/arm/nucleo_c031c6/doc/index.rst b/boards/arm/nucleo_c031c6/doc/index.rst
index b049487..292f7de 100644
--- a/boards/arm/nucleo_c031c6/doc/index.rst
+++ b/boards/arm/nucleo_c031c6/doc/index.rst
@@ -88,6 +88,8 @@
 +-----------+------------+-------------------------------------+
 | I2C       | on-chip    | i2c                                 |
 +-----------+------------+-------------------------------------+
+| DMA       | on-chip    | Direct Memory Access                |
++-----------+------------+-------------------------------------+
 
 Other hardware features are not yet supported in this Zephyr port.
 
diff --git a/boards/arm/nucleo_c031c6/nucleo_c031c6.dts b/boards/arm/nucleo_c031c6/nucleo_c031c6.dts
index e07abdd..0d0d68b 100644
--- a/boards/arm/nucleo_c031c6/nucleo_c031c6.dts
+++ b/boards/arm/nucleo_c031c6/nucleo_c031c6.dts
@@ -125,3 +125,11 @@
 &vref {
 	status = "okay";
 };
+
+&dma1 {
+	status = "okay";
+};
+
+&dmamux1 {
+	status = "okay";
+};
diff --git a/boards/arm/nucleo_c031c6/nucleo_c031c6.yaml b/boards/arm/nucleo_c031c6/nucleo_c031c6.yaml
index cd02363..d7fff9f 100644
--- a/boards/arm/nucleo_c031c6/nucleo_c031c6.yaml
+++ b/boards/arm/nucleo_c031c6/nucleo_c031c6.yaml
@@ -13,5 +13,6 @@
   - pwm
   - adc
   - i2c
+  - dma
 ram: 12
 flash: 32