staging: rts5208: Use common pci_get_bus_and_slot() instead of private one

We already have a inline pci_get_bus_and_slot() in include/linux/pci.h,
Use it instead of local one.
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rts5208/rtsx.h

@@ -48,9 +48,6 @@
 
 #define CR_DRIVER_NAME		"rts5208"
 
-#define pci_get_bus_and_slot(bus, devfn)	\
-	pci_get_domain_bus_and_slot(0, (bus), (devfn))
-
 /*
  * macros for easy use
  */