Remove MMU hacks

Unicorn has included some ugly hacks to provide a envirement where vaddr == paddr.
These hacks where to use the full 64 bit mappings on x86 without init the mmu
and some memory redirect for MIPS.

The UC_TLB_CPU mode defaults to vaddr == paddr, therfor these hacks aren't
required anymore.

qemu/target/m68k/cpu.c

@@ -231,7 +231,6 @@ static void m68k_cpu_class_init(CPUClass *c)
     cc->do_interrupt = m68k_cpu_do_interrupt;
     cc->cpu_exec_interrupt = m68k_cpu_exec_interrupt;
     cc->set_pc = m68k_cpu_set_pc;
-    cc->tlb_fill = m68k_cpu_tlb_fill;
     cc->tlb_fill_cpu = m68k_cpu_tlb_fill;
     cc->get_phys_page_debug = m68k_cpu_get_phys_page_debug;
     cc->tcg_initialize = m68k_tcg_init;