MdeModulePkg: Fix spelling error in PciSioSerialDxe
gSerialDevTempate should be gSerialDevTemplate
Cc: Ray Ni <ray.ni@intel.com> Cc: Zhichao Gao <zhichao.gao@intel.com> Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Michael D Kinney <michael.d.kinney@intel.com> Signed-off-by: Nate DeSimone <nathaniel.l.desimone@intel.com> Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>