tests: add h3ulcb and salvator xs m3configs to perf disk tests

Add MMC related cfgs/overlays of arm64 gen3 rcar boards to perf and
susys/sd/mmc tests.

Signed-off-by: Mykola Kvach <[email protected]>

Author: xakep-amatop

tests/drivers/disk/disk_performance/boards/rcar_h3ulcb_r8a77951_a57.overlay

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+&emmc2 {
+	disk {
+		status = "okay";
+	};
+	status = "okay";
+};

tests/drivers/disk/disk_performance/boards/rcar_salvator_xs.overlay

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+&emmc2 {
+	disk {
+		status = "okay";
+	};
+	status = "okay";
+};

tests/subsys/sd/mmc/boards/rcar_h3ulcb_r8a77951_a57.overlay

@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+&emmc2 {
+	disk {
+		status = "okay";
+	};
+	status = "okay";
+};