boards: nucleo_g071rb: enable adc support

Enable ADC on Nucleo G071RB board(ADC1 channel 0 and 1)

Signed-off-by: Thomas Stranger <thomas.stranger@outlook.com>

Author: str4t0m

boards/arm/nucleo_g071rb/doc/index.rst

@@ -106,6 +106,8 @@ The Zephyr nucleo_g071rb board configuration supports the following hardware fea
 +-----------+------------+-------------------------------------+
 | PWM       | on-chip    | pwm                                 |
 +-----------+------------+-------------------------------------+
+| ADC       | on-chip    | adc                                 |
++-----------+------------+-------------------------------------+
 | DAC       | on-chip    | dac                                 |
 +-----------+------------+-------------------------------------+
 
@@ -134,6 +136,8 @@ Default Zephyr Peripheral Mapping:
 - USER_PB   : PC13
 - LD4       : PA5
 - PWM       : PA6
+- ADC1 IN0  : PA0
+- ADC1 IN1  : PA1
 - DAC1_OUT1 : PA4
 
 For mode details please refer to `STM32 Nucleo-64 board User Manual`_.

boards/arm/nucleo_g071rb/nucleo_g071rb.dts

@@ -89,6 +89,11 @@
 	status = "okay";
 };
 
+&adc1 {
+	pinctrl-0 = <&adc1_in0_pa0 &adc1_in1_pa1>;
+	status = "okay";
+};
+
 &dac1 {
 	status = "okay";
 	pinctrl-0 = <&dac1_out1_pa4>;

boards/arm/nucleo_g071rb/nucleo_g071rb.yaml

@@ -19,4 +19,5 @@ supported:
   - counter
   - watchdog
   - pwm
+  - adc
   - dac

tests/drivers/adc/adc_api/src/test_adc.c

@@ -152,6 +152,7 @@
 	defined(CONFIG_BOARD_NUCLEO_F401RE) || \
 	defined(CONFIG_BOARD_NUCLEO_F429ZI) || \
 	defined(CONFIG_BOARD_NUCLEO_F746ZG) || \
+	defined(CONFIG_BOARD_NUCLEO_G071RB) || \
 	defined(CONFIG_BOARD_NUCLEO_L073RZ) || \
 	defined(CONFIG_BOARD_NUCLEO_WB55RG) || \
 	defined(CONFIG_BOARD_NUCLEO_L152RE) || \