cpu: Pass CPUState to cpu_interrupt()

Move it to qom/cpu.h to avoid issues with include order.

Change pc_acpi_smi_interrupt() opaque to X86CPU.

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/exec.c b/exec.c
index ae5a4b4..c5e65a9 100644
--- a/exec.c
+++ b/exec.c
@@ -1467,7 +1467,7 @@
         /* We re-entered the check after replacing the TB. Now raise
          * the debug interrupt so that is will trigger after the
          * current instruction. */
-        cpu_interrupt(env, CPU_INTERRUPT_DEBUG);
+        cpu_interrupt(ENV_GET_CPU(env), CPU_INTERRUPT_DEBUG);
         return;
     }
     vaddr = (env->mem_io_vaddr & TARGET_PAGE_MASK) + offset;