Bug 1014065: Support PU and WS registers for power management

The PU and WS registers signal Power-Up and Wake State to the NFC
device.

Signed-off-by: Thomas Zimmermann <tdz@users.sourceforge.net>
Bug 1014065: NCI cleanups

Signed-off-by: Thomas Zimmermann <tdz@users.sourceforge.net>
Merge pull request #88 from tdz/bug-1014065

Bug 1014065. r=vicamo