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/kvm-all.c b/kvm-all.c
index 4decfdc..2b761e0 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -830,7 +830,7 @@
 {
     CPUState *cpu = ENV_GET_CPU(env);
 
-    env->interrupt_request |= mask;
+    cpu->interrupt_request |= mask;
 
     if (!qemu_cpu_is_self(cpu)) {
         qemu_cpu_kick(cpu);