UefiCpuPkg/PiSmmCpuDxeSmm: TransferApToSafeState() use UINTN params

UefiCpuPkg/PiSmmCpuDxeSmm: TransferApToSafeState() use UINTN params

Update TransferApToSafeState() use UINTN params to reduce the
number of type casts required in these calls.  Also change
the NumberToFinish parameter from UINT32* to UINTN
NumberToFinishAddress to resolve issues with conversion from
a volatile pointer to a non-volatile pointer.  The assembly
code that receives the NumberToFinishAddress value must treat
that memory location as a volatile to track the number of APs.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Andrew Fish <afish@apple.com>
Cc: Jeff Fan <jeff.fan@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Michael Kinney <michael.d.kinney@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>