target/xtensa: add qemu_cpu_kick to xtensa_runstall

When xtensa_runstall is called to unstall a core it needs to kick it
after clearing runstall flag, otherwise the core doesn't start
immediately. There's also no point in clearing CPU_INTERRUPT_HALT, drop
it.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

target/xtensa/helper.c

@@ -252,7 +252,7 @@ void xtensa_runstall(CPUXtensaState *env, bool runstall)
     if (runstall) {
         cpu_interrupt(cpu, CPU_INTERRUPT_HALT);
     } else {
-        cpu_reset_interrupt(cpu, CPU_INTERRUPT_HALT);
+        qemu_cpu_kick(cpu);
     }
 }
 #endif