Fix some PPC assembler errors.

Fix some PPC assembler errors.

Remove the wait instructions for server processors, since they were never
implemented.  Also add the extra operands added to the tlbie and slbia
instructions with ISA 2.06 and ISA 2.05 respectively.

binutils/
	* MAINTAINERS: Add myself as PPC maintainer.

opcodes/
        * ppc-opc.c (IH) New define.
        (powerpc_opcodes) <wait>: Do not enable for POWER7.
        <tlbie>: Add RS operand for POWER7.
        <slbia>: Add IH operand for POWER6.

gas/testsuite/
        * gas/ppc/power4.d: Add a slbia test.
        * gas/ppc/power4.s: Likewise.
        * gas/ppc/power6.d: Add slbia and tlbie tests.
        * gas/ppc/power6.s: Likewise.
        * gas/ppc/power7.d: Remove wait tests. Add a tlbie test.
        * gas/ppc/power7.s: Likewise.