This implements the security check for incoming LE CoC and in case the
connection cannot attend the minimun security level set by the server
return a proper error:
> ACL Data RX: Handle 72 flags 0x02 dlen 18
LE L2CAP: LE Connection Request (0x14) ident 1 len 10
PSM: 128 (0x0080)
Source CID: 64
MTU: 672
MPS: 230
Credits: 10
< ACL Data TX: Handle 72 flags 0x00 dlen 18
LE L2CAP: LE Connection Response (0x15) ident 1 len 10
Destination CID: 0
MTU: 0
MPS: 0
Credits: 0
Result: Connection refused - insufficient authentication (0x0005)
Change-Id: Ia8b2873c5d1b154eb9a7c1a49c94578c4ec22f6d
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>