OvmfPkg: 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
OvmfPkg.

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: Sunil V L <sunilvl@ventanamicro.com>

OvmfPkg/QemuVideoDxe/Initialize.c

@@ -310,7 +310,7 @@ QemuVideoBochsEdid (
     DEBUG ((
       DEBUG_INFO,
       "%a: mmio read failed\n",
-      __FUNCTION__
+      __func__
       ));
     return;
   }
@@ -321,7 +321,7 @@ QemuVideoBochsEdid (
     DEBUG ((
       DEBUG_INFO,
       "%a: magic check failed\n",
-      __FUNCTION__
+      __func__
       ));
     return;
   }
@@ -329,7 +329,7 @@ QemuVideoBochsEdid (
   DEBUG ((
     DEBUG_INFO,
     "%a: blob found (extensions: %d)\n",
-    __FUNCTION__,
+    __func__,
     Private->Edid[126]
     ));
 
@@ -339,7 +339,7 @@ QemuVideoBochsEdid (
     DEBUG ((
       DEBUG_INFO,
       "%a: no detailed timing descriptor\n",
-      __FUNCTION__
+      __func__
       ));
     return;
   }
@@ -349,7 +349,7 @@ QemuVideoBochsEdid (
   DEBUG ((
     DEBUG_INFO,
     "%a: default resolution: %dx%d\n",
-    __FUNCTION__,
+    __func__,
     *XRes,
     *YRes
     ));
@@ -436,7 +436,7 @@ QemuVideoBochsModeSetup (
         DEBUG_ERROR,
         "%a: can't read size of drawable buffer from QXL "
         "ROM\n",
-        __FUNCTION__
+        __func__
         ));
       return EFI_NOT_FOUND;
     }
@@ -448,7 +448,7 @@ QemuVideoBochsModeSetup (
   DEBUG ((
     DEBUG_INFO,
     "%a: AvailableFbSize=0x%x\n",
-    __FUNCTION__,
+    __func__,
     AvailableFbSize
     ));