UefiCpuPkg/MpInitLib: Remove global variable X2ApicEnable

MpInitLib sets X2ApicEnable in two places.
1. CollectProcessorCount()
   This function is called when MpInitLibInitialize() hasn't been
   called before.
   It sets X2ApicEnable and later in the same function it configures
   all CPUs to operate in X2 APIC mode.
2. MpInitLibInitialize()
   The X2ApicEnable setting happens when this function is called in
   second time. But after that setting, no code consumes that flag.

With the above analysis and with the purpose of simplifying the code,
the X2ApicEnable in #1 is changed to local variable and the #2 can be
changed to remove the setting of X2ApicEnable.

Signed-off-by: Ray Ni <ray.ni@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

UefiCpuPkg/Library/MpInitLib/MpLib.h

@@ -227,7 +227,6 @@ struct _CPU_MP_DATA {
   UINTN                          **FailedCpuList;
 
   AP_INIT_STATE                  InitFlag;
-  BOOLEAN                        X2ApicEnable;
   BOOLEAN                        SwitchBspFlag;
   UINTN                          NewBspNumber;
   CPU_EXCHANGE_ROLE_INFO         BSPInfo;