sim: change ownership to user ID of the calling process for shm file

Change-Id: Ia0b5721421c2eb7fb408d55a26f821d6e95202df
Signed-off-by: Jiuzhu Dong <dongjiuzhu1@xiaomi.com>

arch/sim/src/sim/up_hostmemory.c

@@ -92,6 +92,8 @@ void *host_alloc_shmem(const char *name, size_t size, int master)
       return NULL;
     }
 
+  fchown(fd, getuid(), getgid());
+
   if (!master)
     {
       /* Avoid the second slave instance open successfully */