tests: drivers: build_all: counter: Add i2c-devices build tests

Add build tests for following devices.

- maxim,ds3231
- microchip,mcp7940n

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

tests/drivers/build_all/counter/i2c_devices.overlay

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2024 TOKITA Hiroshi
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	test {
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		test_gpio: gpio@deadbeef {
+			compatible = "vnd,gpio";
+			gpio-controller;
+			reg = <0xdeadbeef 0x1000>;
+			#gpio-cells = <0x2>;
+			status = "okay";
+		};
+
+		test_i2c: i2c@11112222 {
+			#address-cells = <1>;
+			#size-cells = <0>;
+			compatible = "vnd,i2c";
+			reg = <0x11112222 0x1000>;
+			status = "okay";
+			clock-frequency = <100000>;
+
+			test_ds3231: ds3231@0 {
+				compatible = "maxim,ds3231";
+				status = "okay";
+				reg = <0x0>;
+			};
+
+			test_mcp7940n: mcp7940n@1 {
+				compatible = "microchip,mcp7940n";
+				status = "okay";
+				reg = <0x1>;
+			};
+		};
+	};
+};

tests/drivers/build_all/counter/testcase.yaml

@@ -8,3 +8,12 @@ tests:
     platform_allow: arty_a7/designstart_fpga_cortex_m1
     extra_configs:
       - CONFIG_COUNTER_XLNX_AXI_TIMER=y
+  drivers.counter.build.i2c:
+    extra_args: DTC_OVERLAY_FILE="i2c_devices.overlay"
+    extra_configs:
+      - CONFIG_I2C=y
+    platform_allow:
+      - native_posix
+      - native_posix/native/64
+      - native_sim
+      - native_sim/native/64