Remove wrapper rtw_udelay_os()

This wrapper is a simple call to udelay(). Remove it.

Link: https://lore.kernel.org/r/20210805192644.15978-4-Larry.Finger@lwfinger.net

hal/hal_intf.c

@@ -739,7 +739,7 @@ void rtw_hal_write_rfreg(_adapter *padapter, enum rf_path eRFPath, u32 RegAddr,
 
 #ifdef CONFIG_PCI_HCI
 		if (!IS_HARDWARE_TYPE_JAGUAR_AND_JAGUAR2(padapter)) /*For N-Series IC, suggest by Jenyu*/
-			rtw_udelay_os(2);
+			udelay(2);
 #endif
 	}
 }