Document network ports used by bluedroid.

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+Network Ports
+===
+This document lists all of the network ports used by bluedroid. It should be
+used as a reference and as a mechanism to avoid port namespace conflicts.
+
+* TCP 8872 (hci/src/btsnoop_net.c) - read live btsnoop logs
+* TCP 8873 (hci/src/hci_inject.c) - inject HCI packets into HCI stream