OvmfPkg/QemuFwCfgLib: move InternalQemuFwCfgIsAvailable() to lib instances

InternalQemuFwCfgIsAvailable() is an API that is incorrectly exposed by
the "OvmfPkg/Include/Library/QemuFwCfgLib.h" library class header; the API
is meant to be used internally to library instances (if it's needed at
all).

In OvmfPkg, we have two lib instances (for SEC and PEI/DXE); they provide
different implementations of InternalQemuFwCfgIsAvailable(), for the
shared file "OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgLib.c". Move the API
declaration to a new internal header called "QemuFwCfgLibInternal.h", and
drop EFIAPI in the process.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

OvmfPkg/Library/QemuFwCfgLib/QemuFwCfgSec.c

@@ -19,6 +19,7 @@
 #include <Library/DebugLib.h>
 #include <Library/QemuFwCfgLib.h>
 
+#include "QemuFwCfgLibInternal.h"
 
 /**
   Returns a boolean indicating if the firmware configuration interface
@@ -67,7 +68,6 @@ QemuFwCfgIsAvailable (
   @retval    FALSE  The interface is not available internally.
 **/
 BOOLEAN
-EFIAPI
 InternalQemuFwCfgIsAvailable (
   VOID
   )