gas/arc: Fix test for big-endian arc

gas/arc: Fix test for big-endian arc

The inline-data test checks the specific bytes laid down by the
assembler, and so relies on the endianness of the target.  I could
change the expected results to be endian agnostic, however, I worried
that a bug in the assembler that gets the endianness wrong would then
slip through.  Instead I add a new test for big-endian arc, and restrict
the existing test to little-endian arc.

gas/ChangeLog:

	* testsuite/gas/arc/inline-data-1.d: Add target restriction.
	* testsuite/gas/arc/inline-data-2.d: New file.