MdeModulePkg/NvmExpressPei: Use PCI_DEVICE_PPI to manage Nvme device

https://bugzilla.tianocore.org/show_bug.cgi?id=4017

This change modifies NvmExpressPei library
to allow usage both EDKII_PCI_DEVICE_PPI and
EDKII_NVM_EXPRESS_HOST_CONTROLLER_PPI to manage Nvme device.

Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Signed-off-by: Xiao X Chen <xiao.x.chen@intel.com>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>

MdeModulePkg/Bus/Pci/NvmExpressPei/DevicePath.c

@@ -37,50 +37,6 @@ EFI_DEVICE_PATH_PROTOCOL  mNvmeEndDevicePathNodeTemplate = {
   }
 };
 
-/**
-  Returns the 16-bit Length field of a device path node.
-
-  Returns the 16-bit Length field of the device path node specified by Node.
-  Node is not required to be aligned on a 16-bit boundary, so it is recommended
-  that a function such as ReadUnaligned16() be used to extract the contents of
-  the Length field.
-
-  If Node is NULL, then ASSERT().
-
-  @param  Node      A pointer to a device path node data structure.
-
-  @return The 16-bit Length field of the device path node specified by Node.
-
-**/
-UINTN
-DevicePathNodeLength (
-  IN CONST VOID  *Node
-  )
-{
-  ASSERT (Node != NULL);
-  return ReadUnaligned16 ((UINT16 *)&((EFI_DEVICE_PATH_PROTOCOL *)(Node))->Length[0]);
-}
-
-/**
-  Returns a pointer to the next node in a device path.
-
-  If Node is NULL, then ASSERT().
-
-  @param  Node    A pointer to a device path node data structure.
-
-  @return a pointer to the device path node that follows the device path node
-  specified by Node.
-
-**/
-EFI_DEVICE_PATH_PROTOCOL *
-NextDevicePathNode (
-  IN CONST VOID  *Node
-  )
-{
-  ASSERT (Node != NULL);
-  return (EFI_DEVICE_PATH_PROTOCOL *)((UINT8 *)(Node) + DevicePathNodeLength (Node));
-}
-
 /**
   Get the size of the current device path instance.