[POWERPC] Prepare for spu disassembly in xmon

In order to do disassembly of spu binaries in xmon, we need to abstract
the disassembly function from ppc_inst_dump.

We do this by making the actual disassembly function a function pointer
that we pass to ppc_inst_dump(). To save updating all the callers, we
turn ppc_inst_dump() into generic_inst_dump() and make ppc_inst_dump()
a wrapper which always uses print_insn_powerpc().

Currently we pass the dialect into print_insn_powerpc(), but we always
pass 0 - so just make it a local.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>

arch/powerpc/xmon/ppc-dis.c

@@ -27,14 +27,14 @@ extern void print_address (unsigned long memaddr);
 /* Print a PowerPC or POWER instruction.  */
 
 int
-print_insn_powerpc (unsigned long insn, unsigned long memaddr, int dialect)
+print_insn_powerpc (unsigned long insn, unsigned long memaddr)
 {
   const struct powerpc_opcode *opcode;
   const struct powerpc_opcode *opcode_end;
   unsigned long op;
+  int dialect;
 
-  if (dialect == 0)
-    dialect = PPC_OPCODE_PPC | PPC_OPCODE_CLASSIC | PPC_OPCODE_COMMON
+  dialect = PPC_OPCODE_PPC | PPC_OPCODE_CLASSIC | PPC_OPCODE_COMMON
 	      | PPC_OPCODE_64 | PPC_OPCODE_POWER4 | PPC_OPCODE_ALTIVEC;
 
   /* Get the major opcode of the instruction.  */