tests: drivers: build_all: comparator: add silabs_acmp test configurations

Add build test configurations for the silabs_acmp comparator. Enable this
build testing on all series 2 silabs boards that currently support the
comparator driver.

Signed-off-by: Christian Galante <christian.galante@silabs.com>

tests/drivers/build_all/comparator/silabs_acmp/vsense_avdd.overlay

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/comparator/silabs-acmp.h>
+
+&acmp0 {
+	status = "okay";
+
+	bias = <0>;
+	hysteresis-mode = "disabled";
+	accuracy-mode = "low";
+	input-range = "full";
+	input-positive = <ACMP_INPUT_VSENSE01DIV4>;
+	input-negative = <ACMP_INPUT_VREFDIVAVDD>;
+	vref-divider = <63>;
+};

tests/drivers/build_all/comparator/testcase.yaml

@@ -4,6 +4,16 @@ common:
     - drivers
     - comparator
 tests:
+  drivers.build_all.comparator.silabs_acmp.vsense_avdd:
+    extra_args:
+      - DTC_OVERLAY_FILE="silabs_acmp/vsense_avdd.overlay"
+    platform_allow:
+      - xg23_rb4210a
+      - xg24_dk2601b
+      - xg24_ek2703a
+      - xg24_rb4187c
+      - xg27_dk2602a
+      - xg29_rb4412a
   drivers.build_all.comparator.nrf_comp.diff:
     extra_args:
       - DTC_OVERLAY_FILE="nrf_comp/diff.overlay"