ENCX24J600:  Fix some warnings.  Update interface to use newer parameter passing to interrupt handlers

Master

Approved-by: Gregory Nutt <gnutt@nuttx.org>

PF_IEEE802154:  Improve some backlog counting logic; add more assertions to catch cases where the backlog count might deviate from the actual backlog.

PF_IEEE802154:  Add a maximum backlog option.  This will prevent overrun of the RX frame queue if many frames are received from the radio, but no application is receiving the queued data.

PF_IEEE802154: On input, there may be a list of frames provided, not just one.  When closed() and connection is freed, also need to free any frames remaining in the RX queue.

Networking:  Remove driver based backlog support.  This affects the entire network, but is used by only one driver.  The only supported with of supported RX backlog is via common read-ahead buffering.

Merged in juniskane/nuttx/juniskane/chiph-edited-online-with-bitbucket-corre-1503300654585 (pull request #465)

chip.h edited online with Bitbucket: correct some STM32_NDAC

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Master

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Master

Approved-by: Gregory Nutt <gnutt@nuttx.org>

commit 5b7b6e6e616c475c782e9883ada9f4a3b7cb4e2c
Author: Gregory Nutt <gnutt@nuttx.org>
Date:   Sun Aug 20 11:13:17 2017 -0600

    IEEE 802.15.4 network device:  Make same changes as per loopback device so that it will build with PF_IEEE802154 but without 6LoWPAN.

commit d656a98cf8eab2f20e884224b52cd47ec35df4cc
Author: Gregory Nutt <gnutt@nuttx.org>
Date:   Sun Aug 20 10:31:28 2017 -0600

    PF_IEEE802154: More fixes to device registration and to IEEE 802.15.4 loopback driver for PF_IEEE802154 without 6LoWPAN.

commit 866bb9cbb0c5af79734bbd434c07fa2560b6608f
Author: Gregory Nutt <gnutt@nuttx.org>
Date:   Sun Aug 20 09:58:13 2017 -0600

    Network: Reorganize some Kconfig selections.

commit 230b4cb48008cba5fccdafa22340df1d43584829
Author: Gregory Nutt <gnutt@nuttx.org>
Date:   Sun Aug 20 09:19:53 2017 -0600

    Changes to conditional compilation so that PF_IEEE802154 can build without 6LoWPAN

commit d96cbd6520d40590a740f695c4cd72208ce872da
Author: Gregory Nutt <gnutt@nuttx.org>
Date:   Sun Aug 20 09:17:02 2017 -0600

    configs/sim/pf_ieee802154: Disable 6LoWPAN, IPv6, TCP, and UDP.  Now things do not build

stm32_dac.c: fix some configuration logic. When STM32_NDAC is greather than 1, then second channel is always DAC1OUT2.

6LoWPAN/PF_IEEE802154:  Created radiodev.h and renamed various structures to provide a better separation between 6LoWPAN and PF_IEEE802154.

PF_IEEE802154:  With this commit PF_IEEE802154 address family is basically functional.  More testing is needed, of course.