Fix SPI1 & SPI2 DMA mux defines for Teensy 3.5

teensy3/kinetis.h

@@ -479,8 +479,8 @@ enum IRQ_NUMBER_t {
 #define DMAMUX_SOURCE_I2S0_TX		13
 #define DMAMUX_SOURCE_SPI0_RX		14
 #define DMAMUX_SOURCE_SPI0_TX		15
-#define DMAMUX_SOURCE_SPI1_RX		16
-#define DMAMUX_SOURCE_SPI1_TX		17
+#define DMAMUX_SOURCE_SPI1		16
+#define DMAMUX_SOURCE_SPI2		17
 #define DMAMUX_SOURCE_I2C0		18
 #define DMAMUX_SOURCE_I2C1		19
 #define DMAMUX_SOURCE_I2C2		19