aarch64: Remove support for CSRE

aarch64: Remove support for CSRE

This patch removes support for the CSRE extension from aarch64
gas/objdump.
CSRE (FEAT_CSRE) is part of the Future Architecture Technologies program
and at this time Arm is withdrawing this particular feature.

The patch removes the system registers and the CSR PDEC instruction.

gas/ChangeLog
	* NEWS: Remove CSRE.
	* config/tc-aarch64.c (parse_csr_operand): Delete.
	(parse_operands): Delete handling of AARCH64_OPND_CSRE_CSR.
	(aarch64_features): Remove csre.
	* doc/c-aarch64.texi: Remove CSRE.
	* testsuite/gas/aarch64/csre.d: Delete.
	* testsuite/gas/aarch64/csre-invalid.s: Likewise.
	* testsuite/gas/aarch64/csre-invalid.d: Likewise.
	* testsuite/gas/aarch64/csre_csr.s: Likewise.
	* testsuite/gas/aarch64/csre_csr.d: Likewise.
	* testsuite/gas/aarch64/csre_csr-invalid.s: Likewise.
	* testsuite/gas/aarch64/csre_csr-invalid.l: Likewise.
	* testsuite/gas/aarch64/csre_csr-invalid.d: Likewise.

include/ChangeLog

	* opcode/aarch64.h (AARCH64_FEATURE_CSRE): Delete.
	(aarch64_opnd): Delete AARCH64_OPND_CSRE_CSR.

opcodes/ChangeLog

	* aarch64-asm-2.c: Regenerate.
	* aarch64-dis-2.c: Likewise.
	* aarch64-opc-2.c: Likewise.
	* aarch64-opc.c (aarch64_print_operand): Delete handling of
	AARCH64_OPND_CSRE_CSR.
	* aarch64-tbl.h (aarch64_feature_csre): Delete.
	(CSRE): Likewise.
	(_CSRE_INSN): Likewise.
	(aarch64_opcode_table): Delete csr.