PowerPC: Merge rfc2655 and rfc2656 test cases into one future test case

gas/
	* testsuite/gas/ppc/rfc02655.[ds]: Rename from this...
	* testsuite/gas/ppc/future.[ds]: ... to this.
	* testsuite/gas/ppc/rfc02656.[ds]: Delete.  Move tests to future.[ds].
	* testsuite/gas/ppc/ppc.exp: Update for file name changes.
7 files changed