MdePkg SerialPortLib: Upstream Get(Set)Control/SetAttributes interfaces

MdePkg SerialPortLib: Upstream Get(Set)Control/SetAttributes interfaces

The extended interfaces GetControl/SetControl/SetAttributes are from
EmbeddedPkg/Include/Library/SerialPortExtLib.h.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
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>
Reviewed-by: Michael D Kinney <michael.d.kinney@intel.com>
git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18963 6f19259b-4bc3-4df7-8a09-765794883524