target-microblaze: Remove USE_MMU PVR checks

We already have a CPU property to control if a core has
an MMU or not. Remove USE_MMU PVR checks in favor of
looking at the property.
Reviewed-by: NAlistair Francis <alistair.francis@wdc.com>
Reviewed-by: NRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: NEdgar E. Iglesias <edgar.iglesias@xilinx.com>

target/microblaze/helper.c

@@ -54,21 +54,11 @@ int mb_cpu_handle_mmu_fault(CPUState *cs, vaddr address, int size, int rw,
     MicroBlazeCPU *cpu = MICROBLAZE_CPU(cs);
     CPUMBState *env = &cpu->env;
     unsigned int hit;
-    unsigned int mmu_available;
     int r = 1;
     int prot;
 
-    mmu_available = 0;
-    if (cpu->cfg.use_mmu) {
-        mmu_available = 1;
-        if ((cpu->cfg.pvr == C_PVR_FULL) &&
-            (env->pvr.regs[11] & PVR11_USE_MMU) != PVR11_USE_MMU) {
-            mmu_available = 0;
-        }
-    }
-
     /* Translate if the MMU is available and enabled.  */
-    if (mmu_available && (env->sregs[SR_MSR] & MSR_VM)) {
+    if (cpu->cfg.use_mmu && (env->sregs[SR_MSR] & MSR_VM)) {
         uint32_t vaddr, paddr;
         struct microblaze_mmu_lookup lu;