Bluetooth: Start implementing BTPROTO_HCI socket support

Signed-off-by: Brennan Ashton <bashton@brennanashton.com>

include/nuttx/net/net.h

@@ -263,9 +263,9 @@ struct devif_callback_s;  /* Forward reference */
 struct socket
 {
   int16_t       s_crefs;     /* Reference count on the socket */
-  uint8_t       s_domain;    /* IP domain: PF_INET, PF_INET6, or PF_PACKET */
-  uint8_t       s_type;      /* Protocol type: Only SOCK_STREAM or
-                              * SOCK_DGRAM */
+  uint8_t       s_domain;    /* IP domain */
+  uint8_t       s_type;      /* Protocol type */
+  uint8_t       s_proto;     /* Socket Protocol */
   uint8_t       s_flags;     /* See _SF_* definitions */
 
   /* Socket options */