soc: Add initial ESP32-C3 support

From internal commit 7761d6e8

components/soc/esp32c3/include/soc/spi_pins.h

@@ -0,0 +1,39 @@
+// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _SOC_SPI_PINS_H_
+#define _SOC_SPI_PINS_H_
+
+#define SPI_FUNC_NUM            0
+#define SPI_IOMUX_PIN_NUM_HD    12
+#define SPI_IOMUX_PIN_NUM_CS    14
+#define SPI_IOMUX_PIN_NUM_MOSI  16
+#define SPI_IOMUX_PIN_NUM_CLK   15
+#define SPI_IOMUX_PIN_NUM_MISO  17
+#define SPI_IOMUX_PIN_NUM_WP    13
+//TODO: add the next slot
+
+#define FSPI_FUNC_NUM           2
+#define FSPI_IOMUX_PIN_NUM_MISO 2
+#define FSPI_IOMUX_PIN_NUM_HD   4
+#define FSPI_IOMUX_PIN_NUM_WP   5
+#define FSPI_IOMUX_PIN_NUM_CLK  6
+#define FSPI_IOMUX_PIN_NUM_MOSI 7
+#define FSPI_IOMUX_PIN_NUM_CS   10
+
+//TODO: add the next slot
+
+//HSPI and VSPI have no iomux pins
+
+#endif