UefiCpuPkg/MpInitLib: Reduce compiler dependencies for LoongArch

[MarsDoge]

Structure assignment may depend on the compiler to expand to memcpy.
For this, we may need to add -mno-memcpy to the compilation flag.
Here, we reduce dependencies and use CopyMem for data conversion without
memcpy.

Cc: Ray Ni [email protected]
Cc: Rahul Kumar [email protected]
Cc: Gerd Hoffmann [email protected]
Cc: Jiaxin Wu [email protected]
Cc: Chao Li [email protected]
Signed-off-by: Dongyan Qian [email protected]
Co-authored-by: Chao Li [email protected]

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