[FREELDR:XBOX] Fix GCC compilation (reactos#8512)

CORE-16216

Addendum to commit 9e64fa8 (PR reactos#8510)

Fixes GCC complaint when compiling for XBOX (or PC98)
```
boot/freeldr/freeldr/arch/i386/pc/machpc.c:1123:1: error: 'DetectKeyboardController' defined but not used [-Werror=unused-function]
DetectKeyboardController(PCONFIGURATION_COMPONENT_DATA BusKey)
^~~~~~~~~~~~~~~~~~~~~~~~
```

Author: HBelusca

boot/freeldr/freeldr/arch/i386/pc/machpc.c

@@ -982,8 +982,6 @@ DetectParallelPorts(PCONFIGURATION_COMPONENT_DATA BusKey)
     TRACE("DetectParallelPorts() done\n");
 }
 
-#endif // !SARCH_XBOX
-
 // static
 BOOLEAN
 DetectKeyboardDevice(VOID)
@@ -1185,9 +1183,6 @@ DetectKeyboardController(PCONFIGURATION_COMPONENT_DATA BusKey)
     DetectKeyboardPeripheral(ControllerKey);
 }
 
-/* FIXME: Abstract things better so we don't need to place define here */
-#if !defined(SARCH_XBOX)
-
 static
 VOID
 PS2ControllerWait(VOID)