sync with latest net-next

Sync bpf uapi header bpf.h with latest net-next
and update related documentation.

Signed-off-by: Yonghong Song <yhs@fb.com>
diff --git a/introspection/bps.c b/introspection/bps.c
index a809395..4993b8e 100644
--- a/introspection/bps.c
+++ b/introspection/bps.c
@@ -62,6 +62,9 @@
   [BPF_MAP_TYPE_SOCKHASH] = "sockhash",
   [BPF_MAP_TYPE_CGROUP_STORAGE] = "cgroup_storage",
   [BPF_MAP_TYPE_REUSEPORT_SOCKARRAY] = "reuseport_sockarray",
+  [BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE] = "precpu_cgroup_storage",
+  [BPF_MAP_TYPE_QUEUE] = "queue",
+  [BPF_MAP_TYPE_STACK] = "stack",
 };
 
 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))