Implement kernel ARM emulation

[McCaulay]

Checklist

Which kind of PR do you create?

• This PR only contains minor fixes.
• This PR contains major feature update.
• This PR introduces a new function/api for Qiling Framework.

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These fixes add support for emulating a ARM kernel object by implementing R_ARM_CALL and R_ARM_JUMP24. Additionally, the __get_symbol function now has caching in order to speed up loading ARM kernel objects as elftools get_symbol_by_name function is slow when iterating each time.