[AArch64] Add --with-tune configure flag

Pop, Sebastian spop@amazon.com
Tue Nov 17 17:53:15 GMT 2020


Hi,

the attached patch fixes a configure error on Arm64 when passing --with-tune=... to configure:
```
This target does not support --with-tune.
Valid --with options are: abi cpu arch
```
The missing flag sets target tuning to a different value than the generic tuning.

gcc/
                * config.gcc: Add --with-tune to AArch64 configure flags.

Tested on aarch64-linux with bootstrap and regression test.
Ok to commit to trunk and back-port to active branches?

Thanks,
Sebastian

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