exec: Change memory_region_section_get_iotlb() argument to CPUState

It no longer needs CPUArchState since moving watchpoints to CPUState.

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/exec.c b/exec.c
index 7b377cd..82580c5 100644
--- a/exec.c
+++ b/exec.c
@@ -799,14 +799,13 @@
     in_migration = enable;
 }
 
-hwaddr memory_region_section_get_iotlb(CPUArchState *env,
+hwaddr memory_region_section_get_iotlb(CPUState *cpu,
                                        MemoryRegionSection *section,
                                        target_ulong vaddr,
                                        hwaddr paddr, hwaddr xlat,
                                        int prot,
                                        target_ulong *address)
 {
-    CPUState *cpu = ENV_GET_CPU(env);
     hwaddr iotlb;
     CPUWatchpoint *wp;