The other required set of changes

As per the PR, the changes still holding it up.
Add onekey for testing.
Fix ARM builds.
Fix device descriptor when either axes or buttons is zero.
Add compile-time check for at least one axis or button.
Move definition to try to fix conflict.
PR review comments.
qmk cformat

tmk_core/common/report.h

@@ -185,6 +185,16 @@ typedef struct {
     int8_t  h;
 } __attribute__((packed)) report_mouse_t;
 
+typedef struct {
+#if JOYSTICK_AXES_COUNT > 0
+    int8_t axes[JOYSTICK_AXES_COUNT];
+#endif
+
+#if JOYSTICK_BUTTON_COUNT > 0
+    uint8_t buttons[(JOYSTICK_BUTTON_COUNT - 1) / 8 + 1];
+#endif
+} __attribute__((packed)) joystick_report_t;
+
 /* keycode to system usage */
 static inline uint16_t KEYCODE2SYSTEM(uint8_t key) {
     switch (key) {