drivers: i2c: Add support for Apollo3 SoCs I2C

This commit adds support for the I2C which
can be found in Apollo3 SoCs, it can work in
both DMA and non-DMA modes

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

boards/ambiq/apollo3_evb/apollo3_evb.dts

@@ -95,6 +95,14 @@
 	status = "okay";
 };
 
+&i2c3 {
+	compatible = "ambiq,i2c";
+	pinctrl-0 = <&i2c3_default>;
+	pinctrl-names = "default";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	status = "okay";
+};
+
 &gpio0_31 {
 	status = "okay";
 };

boards/ambiq/apollo3_evb/apollo3_evb.yaml

@@ -11,6 +11,7 @@ supported:
   - uart
   - watchdog
   - gpio
+  - i2c
 testing:
   ignore_tags:
     - net

boards/ambiq/apollo3p_evb/apollo3p_evb.dts

@@ -95,6 +95,14 @@
 	status = "okay";
 };
 
+&i2c3 {
+	compatible = "ambiq,i2c";
+	pinctrl-0 = <&i2c3_default>;
+	pinctrl-names = "default";
+	clock-frequency = <I2C_BITRATE_STANDARD>;
+	status = "okay";
+};
+
 &gpio0_31 {
 	status = "okay";
 };

boards/ambiq/apollo3p_evb/apollo3p_evb.yaml

@@ -11,6 +11,7 @@ supported:
   - uart
   - watchdog
   - gpio
+  - i2c
 testing:
   ignore_tags:
     - net