[GAS][AArch64] Add support for Cortex-X1

[Przemyslaw Wirkus]

Hi,

This patch adds support for Cortex-X1

This adds support for the Arm Cortex-X1 CPU in AArch64 GAS. For more
information about this processor, see [0].

[0] : https://www.arm.com/products/cortex-x

gas/ChangeLog:

2020-09-17  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>

	* config/tc-aarch64.c: (aarch64_cpus): Add Cortex-X1.
	* doc/c-aarch64.texi: Document -mcpu=cortex-x1.

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