[GAS][ARM] Fix UDF testism

[GAS][ARM] Fix UDF testism

The old test never checked the objdump output since the 'error-output' directive
would exit and thus never run objdump.  When this test was changed to adhere to
use the new warning_output we started to run objdump.  The expected objdump
output was old and had bitrotten, this fixes the layout, as the "disassembly"
itself did not change.

gas/ChangeLog

2018-10-31  Andre Vieira  <andre.simoesdiasvieira@arm.com>

	* testsuite/gas/arm/udf.d: Update expected output.