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/mips/cpu.c

@@ -147,7 +147,6 @@ static void mips_cpu_class_init(CPUClass *c)
     cc->do_unaligned_access = mips_cpu_do_unaligned_access;
     cc->get_phys_page_debug = mips_cpu_get_phys_page_debug;
     cc->tcg_initialize = mips_tcg_init;
-    cc->tlb_fill = mips_cpu_tlb_fill;
     cc->tlb_fill_cpu = mips_cpu_tlb_fill;
 }