[GAS][arm] 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 AArch32 GAS. For more
information about this processor, see [0].

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

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

bfd/ChangeLog:

2020-09-25  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>

	* cpu-arm.c: (processors) Add Cortex-X1.

gas/ChangeLog:

2020-09-25  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>

	* config/tc-arm.c: (arm_cpus): Add Cortex-X1.
	* doc/c-arm.texi: Document -mcpu=cortex-x1.
	* testsuite/gas/arm/cpu-cortex-x1.d: New test.

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