fix: os_dep/osdep_service.c: Check VFS namespace

In this case,
rockchip's android bsp 5.10.y

Signed-off-by: Steve Jeong <steve@how2flow.net>

os_dep/osdep_service.c

@@ -52,9 +52,11 @@ inline int RTW_STATUS_CODE(int error_code)
 }
 #endif
 
+#ifdef ANDROID_GKI_VFS_EXPORT_ONLY
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(5, 4, 0))
 	MODULE_IMPORT_NS(VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver);
 #endif
+#endif
 
 u32 rtw_atoi(u8 *s)
 {