OvmfPkg/AcpiPlatformDxe: Return error if installing NotifyProtocol failed

OvmfPkg/AcpiPlatformDxe: Return error if installing NotifyProtocol failed

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4237

Installation of gQemuAcpiTableNotifyProtocol may fail. The error code
should be returned so that the caller can handle it.

Cc: Erdem Aktas <erdemaktas@google.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Sebastien Boeuf <sebastien.boeuf@intel.com>
Signed-off-by: Min Xu <min.m.xu@intel.com>
Message-Id: <20230111012235.189-7-min.m.xu@intel.com>
Reviewed-by: Sebastien Boeuf <sebastien.boeuf@intel.com>