app: boards: Add overlays for i.MX8QM and i.MX8QXP

This commit is needed because the current Linux kernel
version used in our internal testing doesn't
contain the patches that enable MU2's power.
As such, to avoid failures in the internal tests,
disable the CCM and LPUART2 IPs.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>

Author: LaurentiuM1234

app/boards/nxp_adsp_imx8.overlay

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2023 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* TODO: this is a temporary workaround the fact that
+ * currently the Linux kernel doesn't enable MU2's power.
+ * As such, CCM (and all IPs that depend on Zephyr's
+ * clock management) are not usable.
+ */
+&lpuart2 {
+	status = "disabled";
+};
+
+&ccm {
+	status = "disabled";
+};

app/boards/nxp_adsp_imx8x.overlay

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2023 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/* TODO: this is a temporary workaround the fact that
+ * currently the Linux kernel doesn't enable MU2's power.
+ * As such, CCM (and all IPs that depend on Zephyr's
+ * clock management) are not usable.
+ */
+&lpuart2 {
+	status = "disabled";
+};
+
+&ccm {
+	status = "disabled";
+};