[GAS][Arm] PR 25472: Enable DSP instructions with +mve

[Andre Vieira (lists)]

Hi,

We noticed +mve was not enabling DSP instructions as it should, reported 
in PR 25472.
The MVE architecture extension for Armv8.1-M Mainline implies DSP 
extensions. This patch reflects that in the '+mve' command line option.

Tested on arm-vxworks, arm-wince-pe and arm-none-eabi.

Is this OK for trunk and backports to 2.33 and 2.34?

Cheers,
Andre

gas/ChangeLog:
2020-01-28  Andre Vieira  <andre.simoesdiasvieira@arm.com>

         PR gas/25472
	* config/tc-arm.c (armv8m_main_ext_table): Refactored +dsp adding.
         (armv8_1m_main_ext_table): Refactored +dsp adding and enabled 
dsp for
	+mve.
	* testsuite/gas/arm/mve_dsp.d: New test.
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