staging: r8188eu: remove defines that strip regs parameter

usb_ops_linux.h has a number of defines that strip the regs parameter from
function that should be used as urb callbacks.

Remove the defines for functions that don't exist in the r8188eu driver.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com> # Edimax N150
Link: https://lore.kernel.org/r/20230124210108.62170-3-martin@kaiser.cxSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/include/usb_ops_linux.h

@@ -13,13 +13,4 @@
 
 #define RTW_USB_BULKOUT_TIME	5000/* ms */
 
-#define _usbctrl_vendorreq_async_callback(urb, regs)	\
-	_usbctrl_vendorreq_async_callback(urb)
-#define usb_bulkout_zero_complete(purb, regs)		\
-	usb_bulkout_zero_complete(purb)
-#define usb_write_mem_complete(purb, regs)		\
-	usb_write_mem_complete(purb)
-#define usb_read_interrupt_complete(purb, regs)		\
-	usb_read_interrupt_complete(purb)
-
 #endif