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/clueboard/66_hotswap/prototype/prototype.c

@@ -8,10 +8,6 @@ void matrix_init_kb(void) {
 	// runs once when the firmware starts up
 	matrix_init_user();
 	led_init_ports();
-
-    // JTAG disable for PORT F. write JTD bit twice within four cycles.
-    MCUCR |= (1<<JTD);
-    MCUCR |= (1<<JTD);
 }