OvmfPkg: Pipeline: Resolve SecureBootVariableLib dependency

OvmfPkg: Pipeline: Resolve SecureBootVariableLib dependency

The new changes in SecureBootVariableLib brought in a new dependency of
PlatformPKProtectionLib.

This change added the new library instance from SecurityPkg to resolve
pipeline builds.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Rebecca Cran <rebecca@bsdio.com>
Cc: Peter Grehan <grehan@freebsd.org>
Cc: Sebastien Boeuf <sebastien.boeuf@intel.com>
Signed-off-by: Kun Qin <kuqin12@gmail.com>
Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
Acked-by: Michael Kubacki <michael.kubacki@microsoft.com>