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/Universal/SmbiosDxe/SmbiosDxe.c

@@ -1157,7 +1157,7 @@ SmbiosCreateTable (
     DEBUG ((
       DEBUG_INFO,
       "%a() re-allocate SMBIOS 32-bit table\n",
-      __FUNCTION__
+      __func__
       ));
     if (EntryPointStructure->TableAddress != 0) {
       //
@@ -1329,7 +1329,7 @@ SmbiosCreate64BitTable (
     DEBUG ((
       DEBUG_INFO,
       "%a() re-allocate SMBIOS 64-bit table\n",
-      __FUNCTION__
+      __func__
       ));
     if (Smbios30EntryPointStructure->TableAddress != 0) {
       //