staging: r8188eu: remove unused PHY_ScanOperationBackup8188E()

Function PHY_ScanOperationBackup8188E() is unused and empty, remove it.
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210908223903.10516-3-straube.linux@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/r8188eu/hal/rtl8188e_phycfg.c

@@ -830,14 +830,6 @@ PHY_UpdateTxPowerDbm8188E(
 	return true;
 }
 
-void
-PHY_ScanOperationBackup8188E(
-		struct adapter *Adapter,
-		u8 Operation
-	)
-{
-}
-
 /*-----------------------------------------------------------------------------
  * Function:    PHY_SetBWModeCallback8192C()
  *

drivers/staging/r8188eu/include/Hal8188EPhyCfg.h

@@ -192,8 +192,6 @@ void rtl8192c_PHY_GetHWRegOriginalValue(struct adapter *adapter);
 void PHY_SetTxPowerLevel8188E(struct adapter *adapter, u8 channel);
 bool PHY_UpdateTxPowerDbm8188E(struct adapter *adapter, int power);
 
-void PHY_ScanOperationBackup8188E(struct adapter *Adapter, u8 Operation);
-
 /*  Switch bandwidth for 8192S */
 void PHY_SetBWMode8188E(struct adapter *adapter,
 			enum ht_channel_width chnlwidth, unsigned char offset);