This patch adds support for PEIMs in UefiDevicePathLib. Although this library and DEVICE_PATH_PROTOCOL
itself was initially intended for DXE the use case of unlocking opal-locked storage devices during S3
resume makes it useful in PEI.

As it is the change will break the users who will need to change the name of the infs. This can be avoided at the cost of
a dedicated inf file just for PEI or by keeping the name UefiDevicePathLibStandaloneMm without adding Pei phase indication.

This change is a preparation for a more robust support for PCIe enumeration in PEI. More details on DevicePath use cases in PEI can
be found in this discussion:
https://edk2.groups.io/g/rfc/topic/proposal_to_add_support_for/86658203?p=,,,20,0,0,0::recentpostdate/sticky,,,20,2,0,86658203,previd=1640220793375011242,nextid=1626916856753718458&previd=1640220793375011242&nextid=1626916856753718458

Tests:
- Change has been tested by building a PEI PciHostBridgeLib instance which uses AppendDevicePathNode function. That PciHostBridgeLib was
  then used in PEIM that enumerates PCI devices and that PEIM was able to get the root bridge information along with the correct root
  bridge device path.

Changes in v2:
- Reverted file name changes, PEIM is added to UefiDevicePathLibStandaloneMm.inf

Change in v3:
- Converted UefiDevicePathLibStandaloneMm.inf to UefiDevicePathLibBase.inf Base lib can be used in every environment but
  but some functionalities in FileDevicePath will not work due to lack of access to EFI_HANDLE in SEC/PEI/SMM.

Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>

Mateusz Albecki (1):
  MdePkg/UefiDevicePathLib: Add support for PEIMs

 MdePkg/Library/UefiDevicePathLib/DevicePathUtilities.c      | 6 ++++++
 ...athUtilitiesStandaloneMm.c => DevicePathUtilitiesBase.c} | 0
 ...icePathLibStandaloneMm.inf => UefiDevicePathLibBase.inf} | 6 +++---
 MdePkg/MdePkg.dsc                                           | 2 +-
 4 files changed, 10 insertions(+), 4 deletions(-)
 rename MdePkg/Library/UefiDevicePathLib/{DevicePathUtilitiesStandaloneMm.c => DevicePathUtilitiesBase.c} (100%)
 rename MdePkg/Library/UefiDevicePathLib/{UefiDevicePathLibStandaloneMm.inf => UefiDevicePathLibBase.inf} (87%)

-- 
2.28.0.windows.1

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