[PATCH][GAS] aarch64: Add support for Cortex-A78C

[Nick Clifton]

Hi Przemyslaw,

> This patch adds support for -mcpu=cortex-a78c command line option.
> For more information about this processor, see [0]:

> 2020-11-04  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>
> 
> 	* config/tc-aarch64.c (aarch64_cpus): Add Cortex-A78C.
> 	* doc/c-aarch64.texi: Document -mcpu=cortex-a78c.

Approved - please apply.

Cheers
   Nick