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/lets_split/sockets/sockets.h

@@ -1,5 +1,4 @@
 #pragma once
-#define DISABLE_JTAG // The keyboard uses PF4 and PF7, which are used by JTAG.
 
 #include "lets_split.h"