ppc: Move exception helpers from helper.c to excp_helper.c

Move exception helpers from helper.c to excp_helper.c and
make cpu_dump_rfi() static.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

target-ppc/cpu.h

@@ -1117,8 +1117,6 @@ int get_physical_address (CPUPPCState *env, mmu_ctx_t *ctx, target_ulong vaddr,
 void do_interrupt (CPUPPCState *env);
 void ppc_hw_interrupt (CPUPPCState *env);
 
-void cpu_dump_rfi (target_ulong RA, target_ulong msr);
-
 #if !defined(CONFIG_USER_ONLY)
 void ppc6xx_tlb_store (CPUPPCState *env, target_ulong EPN, int way, int is_code,
                        target_ulong pte0, target_ulong pte1);