cpu: Turn cpu_handle_mmu_fault() into a CPUClass hook

Note that while such functions may exist both for *-user and softmmu,
only *-user uses the CPUState hook, while softmmu reuses the prototype
for calling it directly.

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/target-mips/cpu.h b/target-mips/cpu.h
index 6981e7a..a1d85ef 100644
--- a/target-mips/cpu.h
+++ b/target-mips/cpu.h
@@ -666,9 +666,8 @@
 void cpu_mips_soft_irq(CPUMIPSState *env, int irq, int level);
 
 /* helper.c */
-int cpu_mips_handle_mmu_fault (CPUMIPSState *env, target_ulong address, int rw,
-                               int mmu_idx);
-#define cpu_handle_mmu_fault cpu_mips_handle_mmu_fault
+int mips_cpu_handle_mmu_fault(CPUState *cpu, vaddr address, int rw,
+                              int mmu_idx);
 #if !defined(CONFIG_USER_ONLY)
 void r4k_invalidate_tlb (CPUMIPSState *env, int idx, int use_extra);
 hwaddr cpu_mips_translate_address (CPUMIPSState *env, target_ulong address,