accel/qaic: mark debugfs stub functions as static inline

The alternative stub functions are listed as global, which produces
a build failure in some configs:

In file included from drivers/accel/qaic/qaic_drv.c:31:
drivers/accel/qaic/qaic_debugfs.h:16:5: error: no previous prototype for 'qaic_bootlog_register' [-Werror=missing-prototypes]
16 | int qaic_bootlog_register(void) { return 0; }
| ^~~~~~~~~~~~~~~~~~~~~
drivers/accel/qaic/qaic_debugfs.h:17:6: error: no previous prototype for 'qaic_bootlog_unregister' [-Werror=missing-prototypes]
17 | void qaic_bootlog_unregister(void) {}
| ^~~~~~~~~~~~~~~~~~~~~~~
drivers/accel/qaic/qaic_debugfs.h:18:6: error: no previous prototype for 'qaic_debugfs_init' [-Werror=missing-prototypes]
18 | void qaic_debugfs_init(struct qaic_drm_device *qddev) {}
| ^~~~~~~~~~~~~~~~~

Make them static inline as intended.

Fixes: 5f8df5c6def6 ("accel/qaic: Add bootlog debugfs")
Signed-off-by: Arnd Bergmann <[e-mail]>
Reviewed-by: Jeffrey Hugo <[e-mail]>
Signed-off-by: Jeffrey Hugo <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/accel/qaic/qaic_debugfs.h

···
 void qaic_bootlog_unregister(void);
 void qaic_debugfs_init(struct qaic_drm_device *qddev);
 #else
-int qaic_bootlog_register(void) { return 0; }
-void qaic_bootlog_unregister(void) {}
-void qaic_debugfs_init(struct qaic_drm_device *qddev) {}
+static inline int qaic_bootlog_register(void) { return 0; }
+static inline void qaic_bootlog_unregister(void) {}
+static inline void qaic_debugfs_init(struct qaic_drm_device *qddev) {}
 #endif /* CONFIG_DEBUG_FS */
 #endif /* __QAIC_DEBUGFS_H__ */