tests/drivers/rtc: Add qemu_x86_64 board to test suite

This commit adds overlay and conf for the qemu_x86_64 board
to the RTC API test suite, and adds support for the RTC
subsystem to the qemu_x86_64's yaml file.

The commit also specifies integration platforms for the
RTC API test suite, since the qemu_x86_64 board runs in
real-time, causing it to time out if the test suite runs
for it.

Signed-off-by: Bjarki Arge Andreasen <bjarkix123@gmail.com>

boards/x86/qemu_x86/qemu_x86_64.yaml

@@ -10,6 +10,7 @@ supported:
   - can
   - smp
   - smbus
+  - rtc
 testing:
   default: true
   ignore_tags:

tests/drivers/rtc/rtc_api/boards/qemu_x86_64.conf

@@ -0,0 +1,5 @@
+# Copyright (c) 2023 Bjarki Arge Andreasen
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_RTC_ALARM=y
+CONFIG_RTC_UPDATE=y

tests/drivers/rtc/rtc_api/boards/qemu_x86_64.overlay

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2023 Bjarki Arge Andreasen
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * The RTC IRQ is not routed to the IOAPIC if the legacy
+ * IRQ bit is set. The IRQ is required for alarm
+ * operation and the update callback.
+ */
+&hpet {
+        no-legacy-irq;
+};
+
+&rtc {
+        status = "okay";
+};

tests/drivers/rtc/rtc_api/testcase.yaml

@@ -9,3 +9,5 @@ tests:
       - api
     filter: dt_alias_exists("rtc")
     depends_on: rtc
+    platform_exclude:
+      - qemu_x86_64