remove spi has transaction from spi.h this is defined elsewhere

Author: Wenn0101

libraries/SPI/src/SPI.h

@@ -10,10 +10,6 @@
 #include "core-api/api/HardwareSPI.h"
 #include "drivers/SPI.h"
 
-// SPI_HAS_TRANSACTION means SPI has beginTransaction(), endTransaction(),
-// usingInterrupt(), and SPISetting(clock, bitOrder, dataMode)
-#define SPI_HAS_TRANSACTION 1
-
 namespace arduino {
 
 class MbedSPI : public SPIClass