esp32/machine_hw_spi: Use auto DMA channel on S2, S3, C3 chips.

Auto DMA channel is supported in IDF v4.4, and is required to be used on S3
chips, so use this simpler configuration option where possible.

Fixes issue #8634.

Signed-off-by: Damien George <damien@micropython.org>

ports/esp32/machine_hw_spi.c

@@ -267,21 +267,15 @@ STATIC void machine_hw_spi_init_internal(
 
     // Select DMA channel based on the hardware SPI host
     int dma_chan = 0;
+    #if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3 || CONFIG_IDF_TARGET_ESP32C3
+    dma_chan = SPI_DMA_CH_AUTO;
+    #else
     if (self->host == HSPI_HOST) {
-        #if CONFIG_IDF_TARGET_ESP32S2 || CONFIG_IDF_TARGET_ESP32S3 || CONFIG_IDF_TARGET_ESP32C3
-        dma_chan = 3;
-        #else
         dma_chan = 1;
-        #endif
-    #ifdef FSPI_HOST
-    } else if (self->host == FSPI_HOST) {
-        dma_chan = 1;
-    #endif
-    #ifdef VSPI_HOST
-    } else if (self->host == VSPI_HOST) {
+    } else {
         dma_chan = 2;
-    #endif
     }
+    #endif
 
     ret = spi_bus_initialize(self->host, &buscfg, dma_chan);
     switch (ret) {