MdePkg/UefiDevicePathLib: Add support for PEIMs

MdePkg/UefiDevicePathLib: Add support for PEIMs

DevicePathLib utilities are useful in PEI to locate the devices which need
an opal unlock on S3 resume. This commit reuses the implementation done
for standalone MM support and makes the StandaloneMm library Base.

Signed-off-by: Mateusz Albecki <mateusz.albecki@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>