OvmfPkg/RiscVVirt/Sec: clean up ProcessLibraryConstructorList() decl

<Library/PeimEntryPoint.h> declares a bogus
ProcessLibraryConstructorList() for the OvmfPkg/RiscVVirt SEC module. Rely
on AutoGen for (properly) declaring ProcessLibraryConstructorList().
Remove the correct, but superfluous, declaration as well.

Build-tested with:

  build -a RISCV64 -b DEBUG -m OvmfPkg/RiscVVirt/Sec/SecMain.inf \
    -p OvmfPkg/RiscVVirt/RiscVVirtQemu.dsc -t GCC5

Cc: Andrei Warkentin <andrei.warkentin@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Sunil V L <sunilvl@ventanamicro.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=990
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20240305113843.68812-5-lersek@redhat.com>
Reviewed-by: Sunil V L <sunilvl@ventanamicro.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>

OvmfPkg/RiscVVirt/Sec/Memory.c

@@ -25,7 +25,6 @@ Module Name:
 #include <Library/HobLib.h>
 #include <Library/IoLib.h>
 #include <Library/PcdLib.h>
-#include <Library/PeimEntryPoint.h>
 #include <Library/ResourcePublicationLib.h>
 #include <Library/BaseRiscVSbiLib.h>
 #include <Register/RiscV64/RiscVEncoding.h>