Remove superfluous JTAG disable code (#6445)

* Remove superfluous JTAG disable code

* 32A has differently named register

* Accidentally some operators

* 32A also has different JTAG pins

* Wrap disable_jtag() in an ifndef

* Document this new define

* Rename the define, it conflicts with a LUFA thing

Also, move the ifndef wrapping to the call in keyboard_setup()

keyboards/ergodone/matrix.c

@@ -77,10 +77,6 @@ uint8_t matrix_cols(void)
 
 void matrix_init(void)
 {
-  // disable JTAG
-  MCUCR = (1<<JTD);
-  MCUCR = (1<<JTD);
-
   unselect_rows();
   init_cols();