[GAS][AArch64] Add support for Cortex-A78 and Cortex-A78AE

[Przemyslaw Wirkus]

This patch introduces support for Cortex-A78 [0] and Cortex-A78AE [1]
cpus.

	[0]: https://www.arm.com/products/silicon-ip-cpu/cortex-a/cortex-a78
	[1]: https://www.arm.com/products/silicon-ip-cpu/cortex-a/cortex-a78ae

OK for master branch ?

PS: I do not have write permission, can this be commited in my name if
approved please?

kind regards
Przemyslaw Wirkus

gas/ChangeLog:

2020-09-30  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>

	* config/tc-aarch64.c: Add Cortex-A78 and Cortex-A78AE cores.
	* doc/c-aarch64.texi: Update docs.
	* NEWS: Update news.
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