ArmPkg/ArmLib: remove unused ArmCleanDataCacheToPoU()

The function ArmCleanDataCacheToPoU() has no users, and its purpose
is unclear, since it uses cache maintenance by set/way to perform
the clean to PoU, which is a dubious practice to begin with. So
remove the declaration and all definitions.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18752 6f19259b-4bc3-4df7-8a09-765794883524

ArmPkg/Library/ArmLib/ArmV7/ArmV7Lib.c

@@ -208,26 +208,6 @@ ArmV7DataCacheOperation (
   }
 }
 
-
-VOID
-ArmV7PoUDataCacheOperation (
-  IN  ARM_V7_CACHE_OPERATION  DataCacheOperation
-  )
-{
-  UINTN     SavedInterruptState;
-
-  SavedInterruptState = ArmGetInterruptState ();
-  ArmDisableInterrupts ();
-
-  ArmV7PerformPoUDataCacheOperation (DataCacheOperation);
-
-  ArmDrainWriteBuffer ();
-
-  if (SavedInterruptState) {
-    ArmEnableInterrupts ();
-  }
-}
-
 VOID
 EFIAPI
 ArmInvalidateDataCache (
@@ -257,13 +237,3 @@ ArmCleanDataCache (
   ArmDrainWriteBuffer ();
   ArmV7DataCacheOperation (ArmCleanDataCacheEntryBySetWay);
 }
-
-VOID
-EFIAPI
-ArmCleanDataCacheToPoU (
-  VOID
-  )
-{
-  ArmDrainWriteBuffer ();
-  ArmV7PoUDataCacheOperation (ArmCleanDataCacheEntryBySetWay);
-}