drivers: Simplify headers

Remove all the headers already included through "fp_internal.h" such as
<libusb.h> and <errno.h>, include "assembling.h" and "driver_ids.h" there
as well to avoid doing it in (almost) every driver.

libfprint/drivers/vfs0050.c

@@ -20,12 +20,6 @@
 #define FP_COMPONENT "vfs0050"
 
 #include "fp_internal.h"
-
-#include <errno.h>
-#include <string.h>
-#include <assembling.h>
-#include "driver_ids.h"
-
 #include "vfs0050.h"
 
 /* USB functions */