MdeModulePkg Variable: ###VariableTotalSize need to be initialized to 0 first

MdeModulePkg Variable: ###VariableTotalSize need to be initialized to 0 first

HwErrVariableTotalSize/CommonVariableTotalSize/CommonUserVariableTotalSize
need to be initialized to 0 first after reclaim failed, then to be assigned by += operation.

Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@19572 6f19259b-4bc3-4df7-8a09-765794883524