UefiCpuPkg: Update code to be more C11 compliant by using __func__

__FUNCTION__ is a pre-standard extension that gcc and Visual C++ among
others support, while __func__ was standardized in C99.

Since it's more standard, replace __FUNCTION__ with __func__ throughout
UefiCpuPkg.

Signed-off-by: Rebecca Cran <rebecca@bsdio.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>

UefiCpuPkg/CpuDxe/CpuDxe.c

@@ -1078,7 +1078,7 @@ IntersectMemoryDescriptor (
       EFI_ERROR (Status) ? DEBUG_ERROR : DEBUG_VERBOSE,
       "%a: %a: add [%Lx, %Lx): %r\n",
       gEfiCallerBaseName,
-      __FUNCTION__,
+      __func__,
       IntersectionBase,
       IntersectionEnd,
       Status
@@ -1091,7 +1091,7 @@ IntersectMemoryDescriptor (
     "%a: %a: desc [%Lx, %Lx) type %u cap %Lx conflicts "
     "with aperture [%Lx, %Lx) cap %Lx\n",
     gEfiCallerBaseName,
-    __FUNCTION__,
+    __func__,
     Descriptor->BaseAddress,
     Descriptor->BaseAddress + Descriptor->Length,
     (UINT32)Descriptor->GcdMemoryType,
@@ -1132,7 +1132,7 @@ AddMemoryMappedIoSpace (
       DEBUG_ERROR,
       "%a: %a: GetMemorySpaceMap(): %r\n",
       gEfiCallerBaseName,
-      __FUNCTION__,
+      __func__,
       Status
       ));
     return Status;
@@ -1215,7 +1215,7 @@ AddLocalApicMemorySpace (
       DEBUG_INFO,
       "%a: %a: AllocateMemorySpace() Status - %r\n",
       gEfiCallerBaseName,
-      __FUNCTION__,
+      __func__,
       Status
       ));
   }