MdeModulePkg: Add definitions for EDKII PEI NVME host controller PPI

MdeModulePkg: Add definitions for EDKII PEI NVME host controller PPI

Introduces the below PPI:

struct EDKII_NVM_EXPRESS_HOST_CONTROLLER_PPI {
  EDKII_NVM_EXPRESS_HC_GET_MMIO_BAR       GetNvmeHcMmioBar;
  EDKII_NVM_EXPRESS_HC_GET_DEVICE_PATH    GetNvmeHcDevicePath;
};

The GetNvmeHcMmioBar service will provide the caller with the MMIO BAR
address of each NVMe HC within the system;

The GetNvmeHcDevicePath service will provide the caller with the device
path information of each NVMe HC.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>