ArmPlatformPkg: remove ArmPlatformInitializeSystemMemory

The function ArmPlatformInitializeSystemMemory() is defined by
ArmPlatformLib, but is only ever called when using the PrePeiCore
flavor of the startup code. Also, none of the remaining upstream
platforms actually implement anything in that function in the first
place. So let's just remove it altogether.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>

ArmPlatformPkg/MemoryInitPei/MemoryInitPeim.c

@@ -103,14 +103,6 @@ InitializeMemory (
 
   DEBUG ((EFI_D_LOAD | EFI_D_INFO, "Memory Init PEIM Loaded\n"));
 
-  //
-  // Initialize the System Memory (DRAM)
-  //
-  if (!FeaturePcdGet (PcdSystemMemoryInitializeInSec)) {
-    // In case the DRAM has not been initialized by the secure firmware
-    ArmPlatformInitializeSystemMemory ();
-  }
-
   // Ensure PcdSystemMemorySize has been set
   ASSERT (PcdGet64 (PcdSystemMemorySize) != 0);
   ASSERT (PcdGet64 (PcdSystemMemoryBase) < (UINT64)MAX_ADDRESS);