[ARM] Remove ARM_FEATURE_COPY macro

[ARM] Remove ARM_FEATURE_COPY macro

Among the macros to manipulate an arm_feature_set structure is the
ARM_FEATURE_COPY which copy the value of a feature set into another.
This can be achieved with a simple assignement which most of the
existing code does. This patch removes the last 2 uses of that macro and
remove the macro altogether.

2018-02-27  Thomas Preud'homme  <thomas.preudhomme@arm.com>

include/
	* opcode/arm.h (ARM_FEATURE_COPY): Remove macro definition.

2018-02-27  Thomas Preud'homme  <thomas.preudhomme@arm.com>

opcodes/
	* arm-dis.c (print_insn_coprocessor): Replace uses of ARM_FEATURE_COPY
	macro by assignements.