[GAS][ARM][AArch64] Update NEWS with recent changes to ARM and AArch64

[Przemyslaw Wirkus]

Hi,

Changes include recent GAS updates to:
* TRBE, ETE and ETMv4 system registers and
* Cortex-X1 enablement.

OK for master branch?

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

Kind regards,
Przemyslaw Wirkus

gas/ChangeLog:

2020-09-28  Przemyslaw Wirkus  <przemyslaw.wirkus@arm.com>

	* NEWS: TRBE, ETE, ETMv4 and Cortex-X1 news updates.
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