MdeModulePke: PeiCore FirmwareVolmeInfoPpiNotifyCallback ()issue

MdeModulePke: PeiCore FirmwareVolmeInfoPpiNotifyCallback ()issue

PeiCore FirmwareVolmeInfoPpiNotifyCallback() should check FvCount when new one is added.
Now, this check is the entry of Notify function that is too early, because PeiCore will
install FvInfo and FvInfo2 both for one sub FV image and trig FvNotify function twice for the same FV images.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Guo Dong <guo.dong@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16520 6f19259b-4bc3-4df7-8a09-765794883524