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-lm32/helper.c b/target-lm32/helper.c
index 615b44e..15bc615 100644
--- a/target-lm32/helper.c
+++ b/target-lm32/helper.c
@@ -37,10 +37,12 @@
     return 0;
 }
 
-hwaddr cpu_get_phys_page_debug(CPULM32State *env, target_ulong addr)
+hwaddr lm32_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
 {
+    LM32CPU *cpu = LM32_CPU(cs);
+
     addr &= TARGET_PAGE_MASK;
-    if (env->flags & LM32_FLAG_IGNORE_MSB) {
+    if (cpu->env.flags & LM32_FLAG_IGNORE_MSB) {
         return addr & 0x7fffffff;
     } else {
         return addr;