drivers: adc: add dma support for ambiq adc driver

This commit adds dma support for ambiq adc driver

Signed-off-by: Hao Luo <hluo@ambiq.com>

Author: AlessandroLuo

boards/ambiq/apollo510_evb/apollo510_evb-pinctrl.dtsi

@@ -32,7 +32,7 @@
 
 	adc0_default: adc0_default{
 		group1 {
-			pinmux = <ADCSE4_P15>, <ADCSE7_P12>;
+			pinmux = <ADCSE5_P14>, <ADCSE6_P13>;
 			drive-strength = "0.1";
 		};
 	};

boards/rakwireless/rak11720/rak11720.dts

@@ -162,10 +162,6 @@
 	status = "okay";
 };
 
-&counter3 {
-	status = "okay";
-};
-
 &counter4 {
 	status = "okay";
 };

drivers/adc/Kconfig.ambiq

@@ -8,5 +8,17 @@ config ADC_AMBIQ
 	depends on DT_HAS_AMBIQ_ADC_ENABLED
 	select AMBIQ_HAL
 	select AMBIQ_HAL_USE_ADC
+	select AMBIQ_HAL_USE_TIMER if SOC_SERIES_APOLLO3X
 	help
 	  Enables the Adc driver for Ambiq devices.
+
+if ADC_AMBIQ
+
+config ADC_AMBIQ_HANDLE_CACHE
+	bool "Turn on cache handling in adc driver"
+	default y
+	depends on CACHE_MANAGEMENT && DCACHE
+	help
+	  Disable this if cache has been handled in upper layers.
+
+endif # ADC_AMBIQ