change the main scan class so they scan only for wanted bits - UNTESTED

src/detect/ScanI2C.h

@@ -2,7 +2,6 @@
 
 #include <stddef.h>
 #include <stdint.h>
-bool performScanForCardKB();
 
 class ScanI2C
 {
@@ -89,6 +88,7 @@ class ScanI2C
     ScanI2C();
 
     virtual void scanPort(ScanI2C::I2CPort);
+    virtual void scanPort(ScanI2C::I2CPort, int *);
 
     /*
      * A bit of a hack, this tells the scanner not to tell later systems there is a screen to avoid enabling it.