UefiCpuPkg/MtrrLibUnitTest: Change to use static array for CI test

The unit test app supports running in 3 mode:
1. MtrrLibUnitTest generate-random-numbers
     <path to MtrrLib/UnitTest/RandomNumber.c> <random-number count>
   It generates random numbers and writes to RandomNumber.c.

2. MtrrLibUnitTest [<iterations>]
   It tests MtrrLib APIs using configurations generated from static
   numbers generated by mode #1.
   This is the default execution mode running in CI environment.

3. MtrrLibUnitTest <iterations> random
   It tests MtrrLib APIs using configurations generated from random
   numbers.
   This is what developers can use to test MtrrLib for regressions.

Signed-off-by: Ray Ni <ray.ni@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ming Shao <ming.shao@intel.com>
Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Bret Barkelew <Bret.Barkelew@microsoft.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>

UefiCpuPkg/Library/MtrrLib/UnitTest/MtrrLibUnitTest.h

@@ -43,6 +43,7 @@ typedef struct {
 } MTRR_LIB_SYSTEM_PARAMETER;
 
 extern UINT32                           mFixedMtrrsIndex[];
+extern BOOLEAN                          mRandomInput;
 
 /**
   Initialize the MTRR registers.
@@ -179,4 +180,16 @@ Random32 (
   UINT32  Start,
   UINT32  Limit
   );
+
+/**
+  Generate Count random numbers in FilePath.
+
+  @param FilePath  The file path to put the generated random numbers.
+  @param Count     Count of random numbers.
+**/
+VOID
+GenerateRandomNumbers (
+  CHAR8         *FilePath,
+  UINTN         Count
+  );
 #endif