MdeModulePkg: 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
MdeModulePkg.

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>

MdeModulePkg/Core/Dxe/Dispatcher/Dispatcher.c

@@ -1095,7 +1095,7 @@ CoreProcessFvImageFile (
         DEBUG ((
           DEBUG_INFO,
           "%a() FV at 0x%x, FvAlignment required is 0x%x\n",
-          __FUNCTION__,
+          __func__,
           FvHeader,
           FvAlignment
           ));

MdeModulePkg/Core/Dxe/DxeMain/DxeMain.c

@@ -315,7 +315,7 @@ DxeMain (
   DEBUG ((
     DEBUG_INFO,
     "%a: MemoryBaseAddress=0x%Lx MemoryLength=0x%Lx\n",
-    __FUNCTION__,
+    __func__,
     MemoryBaseAddress,
     MemoryLength
     ));

MdeModulePkg/Core/Dxe/Misc/MemoryProtection.c

@@ -838,7 +838,7 @@ InitializeDxeNxMemoryProtectionPolicy (
         DEBUG ((
           DEBUG_INFO,
           "%a: StackBase = 0x%016lx  StackSize = 0x%016lx\n",
-          __FUNCTION__,
+          __func__,
           MemoryHob->AllocDescriptor.MemoryBaseAddress,
           MemoryHob->AllocDescriptor.MemoryLength
           ));
@@ -864,7 +864,7 @@ InitializeDxeNxMemoryProtectionPolicy (
   DEBUG ((
     DEBUG_INFO,
     "%a: applying strict permissions to active memory regions\n",
-    __FUNCTION__
+    __func__
     ));
 
   MergeMemoryMapForProtectionPolicy (MemoryMap, &MemoryMapSize, DescriptorSize);
@@ -926,7 +926,7 @@ InitializeDxeNxMemoryProtectionPolicy (
     DEBUG ((
       DEBUG_INFO,
       "%a: applying strict permissions to inactive memory regions\n",
-      __FUNCTION__
+      __func__
       ));
 
     CoreAcquireGcdMemoryLock ();

MdeModulePkg/Core/Dxe/SectionExtraction/CoreSectionExtraction.c

@@ -1304,7 +1304,7 @@ GetSection (
         DEBUG ((
           DEBUG_ERROR,
           "%a: recursion aborted due to nesting depth\n",
-          __FUNCTION__
+          __func__
           ));
         //
         // Map "aborted" to "not found".