Reduce interfaces on mega variant

Mega doesn't specifically call out other I2C pins so we need only 1 I2C and 1 SPI port defined.

I made the original change to 6 a few commits back. This undoes my bad work.

Author: Nathan Seidle

variants/SparkFun_BlackBoard_Artemis_Mega/config/variant.h

@@ -35,13 +35,13 @@ extern Uart Serial;
 extern Uart Serial1;
 
 // Wire defines
-#define WIRE_INTERFACES_COUNT 6
+#define WIRE_INTERFACES_COUNT 1
 
 #define WireQwiic Wire // Giving Wire an alias of "WireQwiic" in case people want to use it
 #define AP3_Wire_IOM 4 // Secify that Wire uses IOMaster instance 4
 
 // SPI Defines
-#define SPI_INTERFACES_COUNT 6
+#define SPI_INTERFACES_COUNT 1
 
 #define AP3_SPI_IOM 0                   // Specify that SPI uses IOMaster 0
 #define AP3_SPI_DUP ap3_spi_full_duplex // Specify that SPI is full-duplex (as opposed to ap3_spi_tx_only or ap3_spi_rx_only)