cpu: Turn cpu_get_phys_page_debug() into a CPUClass hook

Change breakpoint_invalidate() argument to CPUState alongside.

Since all targets now assign a softmmu-only field, we can drop helpers
cpu_class_set_{do_unassigned_access,vmsd}() and device_class_set_vmsd().

Prepares for changing cpu_memory_rw_debug() argument to CPUState.

Acked-by: Max Filippov <jcmvbkbc@gmail.com> (for xtensa)
Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/target-openrisc/mmu.c b/target-openrisc/mmu.c
index d354e1f..57f5616 100644
--- a/target-openrisc/mmu.c
+++ b/target-openrisc/mmu.c
@@ -219,12 +219,11 @@
 #endif
 
 #ifndef CONFIG_USER_ONLY
-hwaddr cpu_get_phys_page_debug(CPUOpenRISCState *env,
-                                           target_ulong addr)
+hwaddr openrisc_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
 {
+    OpenRISCCPU *cpu = OPENRISC_CPU(cs);
     hwaddr phys_addr;
     int prot;
-    OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
 
     if (cpu_openrisc_get_phys_addr(cpu, &phys_addr, &prot, addr, 0)) {
         return -1;