[Driver][AArch64] Simplify -mtune
llvm::sys::getHostCPUName()'s return value is not empty. `-mtune=` (empty value) has caused a driver error. So we can omit `!TuneCPU.empty()` check.
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llvm::sys::getHostCPUName()'s return value is not empty. `-mtune=` (empty value) has caused a driver error. So we can omit `!TuneCPU.empty()` check.