cpu: Move halted and interrupt_request fields to CPUState

Both fields are used in VMState, thus need to be moved together.
Explicitly zero them on reset since they were located before
breakpoints.

Pass PowerPCCPU to kvmppc_handle_halt().

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/target-sparc/helper.c b/target-sparc/helper.c
index 58e7efe..57c20af 100644
--- a/target-sparc/helper.c
+++ b/target-sparc/helper.c
@@ -229,7 +229,9 @@
 #ifndef TARGET_SPARC64
 void helper_power_down(CPUSPARCState *env)
 {
-    env->halted = 1;
+    CPUState *cs = CPU(sparc_env_get_cpu(env));
+
+    cs->halted = 1;
     env->exception_index = EXCP_HLT;
     env->pc = env->npc;
     env->npc = env->pc + 4;