target-lm32: init tcg only if available

Once qtest support for target-lm32 arrives, tcg may be disabled.

Signed-off-by: Michael Walle <michael@walle.cc>

target-lm32/helper.c

@@ -215,7 +215,7 @@ CPULM32State *cpu_lm32_init(const char *cpu_model)
     cpu_state_reset(env);
     qemu_init_vcpu(env);
 
-    if (!tcg_initialized) {
+    if (tcg_enabled() && !tcg_initialized) {
         tcg_initialized = 1;
         lm32_translate_init();
     }