RedfishPkg: 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
RedfishPkg.

Signed-off-by: Rebecca Cran <rebecca@bsdio.com>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
Ard Biesheuvel <ardb@kernel.org>
Reviewed-by: Nickle Wang <nicklew@nvidia.com>

RedfishPkg/PrivateLibrary/RedfishLib/RedfishLib.c

@@ -1101,7 +1101,7 @@ RedfishIsValidOdataType (
     }
   }
 
-  DEBUG ((DEBUG_INFO, "%a: This Odata type is not in the list.\n", __FUNCTION__));
+  DEBUG ((DEBUG_INFO, "%a: This Odata type is not in the list.\n", __func__));
   return FALSE;
 }