ARM: Document AArch64 version of qemu-arm
It's mostly obvious, except that QEMU is annoying and requires an explicit '-cpu cortex-a57' (or some other 64-bit core) to actually run in 64-bit mode. While at it, remove the references to setting the ARCH environment variable; that is not used in U-Boot. Signed-off-by: NTuomas Tynkkynen <tuomas.tynkkynen@iki.fi> Reviewed-by: NTom Rini <trini@konsulko.com>
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