arm64: select FUNCTION_ALIGNMENT_16B

Hi,

Before arm64 explicitly selects FUNCTION_ALIGNMENT_4B or FUNCTION_ALIGNMENT_8B if DYNAMIC_FTRACE_WITH_CALL_OPS, the compiler's default function alignment is used. IIUC, gcc for aarch64 default alignment is 16B when -O2, so to keep the same effect, do we need to select FUNCTION_ALIGNMENT_16B instead?

Thanks

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