EmbeddedPkg/PrePiMemoryAllocationLib: Added AllocateZeroPool()

This function is exposed by the MemoryAllocationLib header.
An AllocateZeroPool() function has been added to fix modules depending on
this library and this function.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Jeff Brasen <jbrasen@nvidia.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c

@@ -16,6 +16,7 @@
 #include <PiPei.h>
 
 #include <Library/BaseLib.h>
+#include <Library/BaseMemoryLib.h>
 #include <Library/PrePiLib.h>
 #include <Library/DebugLib.h>
 
@@ -194,6 +195,37 @@ AllocatePool (
   }
 }
 
+/**
+  Allocates and zeros a buffer of type EfiBootServicesData.
+
+  Allocates the number bytes specified by AllocationSize of type EfiBootServicesData, clears the
+  buffer with zeros, and returns a pointer to the allocated buffer.  If AllocationSize is 0, then a
+  valid buffer of 0 size is returned.  If there is not enough memory remaining to satisfy the
+  request, then NULL is returned.
+
+  @param  AllocationSize        The number of bytes to allocate and zero.
+
+  @return A pointer to the allocated buffer or NULL if allocation fails.
+
+**/
+VOID *
+EFIAPI
+AllocateZeroPool (
+  IN UINTN  AllocationSize
+  )
+{
+  VOID *Buffer;
+
+  Buffer = AllocatePool (AllocationSize);
+  if (Buffer == NULL) {
+    return NULL;
+  }
+
+  ZeroMem (Buffer, AllocationSize);
+
+  return Buffer;
+}
+
 /**
   Frees a buffer that was previously allocated with one of the pool allocation functions in the
   Memory Allocation Library.