[PATCH][GAS] aarch64: Update LS64 feature with system register

[Przemyslaw Wirkus]

This patch:
+ Adds new ACCDATA_EL1 (Accelerator Data) system register, see [0].
+ Adds LS64 instruction tests.
+ Update LS64 feature test with new register.

    [0] https://developer.arm.com/docs/ddi0595/i/aarch64-system-registers/accdata_el1

Note: as this is register only extension, we do not want to hide these
registers behind -march flag going forward (they should be enabled by
default).

Regression tested against master branch and no issues.

OK for master branch?

gas/ChangeLog:

2020-11-05  Przemyslaw Wirkus  <mailto:przemyslaw.wirkus@arm.com>

	* testsuite/gas/aarch64/ls64.d: New test.
	* testsuite/gas/aarch64/ls64.s: Test for ACCDATA_EL1 register.

opcodes/ChangeLog:

2020-11-05  Przemyslaw Wirkus  <mailto:przemyslaw.wirkus@arm.com>

	* aarch64-opc.c: Add ACCDATA_EL1 system register

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