NFC: Initial LLCP support

This patch is an initial implementation for the NFC Logical Link Control
protocol. It's also known as NFC peer to peer mode.
This is a basic implementation as it lacks SDP (services Discovery
Protocol), frames aggregation support, and frame rejecion parsing.
Follow up patches will implement those missing features.
This code has been tested against a Nexus S phone implementing LLCP 1.0.

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/nfc/Kconfig b/net/nfc/Kconfig
index 58cddad..44c865b 100644
--- a/net/nfc/Kconfig
+++ b/net/nfc/Kconfig
@@ -14,5 +14,6 @@
 	  be called nfc.
 
 source "net/nfc/nci/Kconfig"
+source "net/nfc/llcp/Kconfig"
 
 source "drivers/nfc/Kconfig"