UefiCpuPkg/CpuDxe: Remove PcdCpuMaxLogicalProcessorNumber consuming

UefiCpuPkg/CpuDxe: Remove PcdCpuMaxLogicalProcessorNumber consuming

v5:
  If PcdCpuMaxLogicalProcessorNumber is set to 1 on UP system,
  MpInitLibInitialize() will be invoked. This is one bug, we need to
  call MpInitLibInitialize() always and get the BSP information.
  Just to remove PcdCpuMaxLogicalProcessorNumber() consuming from this
  driver.

Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Feng Tian <feng.tian@intel.com>
Cc: Giri P Mudusuru <giri.p.mudusuru@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jeff Fan <jeff.fan@intel.com>
Reviewed-by: Michael Kinney <michael.d.kinney@intel.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Tested-by: Michael Kinney <michael.d.kinney@intel.com>