bpf: Add BPF_MAP_TYPE_QUEUE and BPF_MAP_TYPE_STACK to bpftool-map

I noticed that these two new BPF Maps are not defined in bpftool.
This patch defines those two maps and adds their names to the
bpftool-map documentation.
Signed-off-by: David Calavera <david.calavera@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

tools/bpf/bpftool/Documentation/bpftool-map.rst

@@ -42,7 +42,8 @@ MAP COMMANDS
 |		| **percpu_array** | **stack_trace** | **cgroup_array** | **lru_hash**
 |		| **lru_percpu_hash** | **lpm_trie** | **array_of_maps** | **hash_of_maps**
 |		| **devmap** | **sockmap** | **cpumap** | **xskmap** | **sockhash**
-|		| **cgroup_storage** | **reuseport_sockarray** | **percpu_cgroup_storage** }
+|		| **cgroup_storage** | **reuseport_sockarray** | **percpu_cgroup_storage**
+|		| **queue** | **stack** }
 
 DESCRIPTION
 ===========

tools/bpf/bpftool/map.c

@@ -74,6 +74,8 @@ static const char * const map_type_name[] = {
 	[BPF_MAP_TYPE_CGROUP_STORAGE]	= "cgroup_storage",
 	[BPF_MAP_TYPE_REUSEPORT_SOCKARRAY] = "reuseport_sockarray",
 	[BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE]	= "percpu_cgroup_storage",
+	[BPF_MAP_TYPE_QUEUE] = "queue",
+	[BPF_MAP_TYPE_STACK] = "stack",
 };
 
 static bool map_is_per_cpu(__u32 type)