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

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>