Refine CPUInfo in Arm64

[Pennyzct]

Description of problem

Thanks @jodh-intel for fixing arm build😊, and it may need some refinement for CPUInfo.
Variable vendor and model in struct CPUInfo may refer to different meaning in Arm architecture. The CPU Model for Arm should mean the Instruction set, that is the variant number of Arm processor and the CPU Vendor for Arm should be the CPU core IP Implementer.

Expected result

some example from kata-runtime kata-env:

[Host.CPU]
   Vendor = "ARM Limited"
   Model = "v8"

Actual result

[Host.CPU]
   Vendor = "0x41"
   Model = "0x1"

[Pennyzct]

@Weichen81

[Weichen81]

LGTM @Pennyzct 👍