samples: drivers: spi: Add support for RZ/G3S-SMARC

Enable SPI driver samples for RZ/G3S-SMARC

Signed-off-by: Quang Le <quang.le.eb@bp.renesas.com>
Signed-off-by: Binh Nguyen <binh.nguyen.xw@renesas.com>

samples/drivers/spi_bitbang/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.conf

@@ -0,0 +1,3 @@
+CONFIG_GPIO=y
+CONFIG_SPI_RENESAS_RZ_RSPI_DMAC=n
+CONFIG_NO_OPTIMIZATIONS=y

samples/drivers/spi_bitbang/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.overlay

@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2024 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+spibb0: &spi0 {
+	cs-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
+	status = "okay";
+};
+
+&gpio0 {
+	status = "okay";
+};