Merge pull request micropython#563 from dhalbert/3.0_cpx_circuitpy_fail

CPX: typo in mpconfigboard.h broke CIRCUITPY

Author: tannewt

ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.h

@@ -17,7 +17,7 @@
 #define SPI_FLASH_MISO_PIN_FUNCTION PINMUX_PA16D_SERCOM3_PAD0
 #define SPI_FLASH_SCK_PIN_FUNCTION  PINMUX_PA21D_SERCOM3_PAD3
 #define SPI_FLASH_SERCOM            SERCOM3
-#define SPI_FLASH_SERCOM_INDEX      5
+#define SPI_FLASH_SERCOM_INDEX      3
 #define SPI_FLASH_MOSI_PAD          2
 #define SPI_FLASH_MISO_PAD          0
 #define SPI_FLASH_SCK_PAD           3