ieee802154 MAC: Free allocated TX descriptor if an error occurs after the descriptor has been allocated.

ieee802154_req_data:  Don't modify the IOB until we are certain that no EINTR errors will occur.  Otherwise, the retry will fail

Kinetis:I2C driver added I2C3, reference counting and reset

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

ieee802154 network driver now retries if ieee802154_req_data() returns EINTR.  In clicker2-stm32 6LoWPAN configuration, increased the number of TX descriptors to match then number of IOBs.

   Refactored the driver to support reference counting and reset
   added I2C3

STM32:  Allow clock frequencies > 168 Mhz on stm32f427/429.  We need to enable the power overdrive for this case.  This patch allows the required bits to be set in proper sequence.  It also modifies the local register access operations to allow more than 16-bit registers.

6LoWPAN: Add debug statements; Update configuration, need to specific 6LoWPAN compatible port numbers.

wireless/ieee802154: Cleans up some endianness issues and fixes poll request issue

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

/configs/clicker2-stm32/mrf24j40-6lowpan: Enables both client and server UDP tests on the target; Update a README file.

Use struct instead of pointer to the struct as sizeof argument in memset in usbmsc.c

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

Otherwise it leads to error: argument to 'sizeof' in 'memset' call is the same pointer type 'struct usbmsc_lun_s *' as the destination

Update TODO, enable UDP example in clicker1-stm32/mrf24j40-6lowpan example, make sure that CONFIG_EXAMPLES_UDP_NETINIT is set in all other examples/udp configurations.

stm32_adc: invalidate dma buffer before use.  Missing invalidation caused old samples being fetched from cache.

Support listening sockets in the getsockname function

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

Throw error when error happens in the tcp_listen function

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

Swithches IEEE 802.15.4 based code to using byte arrays instead of uint16_t values for short address and PAN ID

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

Swithches IEEE 802.15.4 based code to using byte arrays instead of uint16_t values for short address and PAN ID