Reworks data_ind allocation to include IOB allocation/deallocation. Hides private data.

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

Upstream kinetis

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

wireless/ieee802154: Reworks data_ind allocation to include IOB allocation/deallocation. Hides private data.

wireless/ieee802154: Removes msdu_length from meta-data since it is intrinsically in the IOB

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

Upstream kinetis i2c pin def

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

   The output structure of the GPIO for I2C needs to be open
   drain.  When left at the default, one can observe on a scope
   the slave contending with the push-pull during the ACK

   The output structure of the GPIO for I2C needs to be open
   drain.  When left at the default, one can observe on a scope
   the slave contending with the push-pull during the ACK

   The output structure of the GPIO for I2C needs to be open
   drain.  When left at the default, one can observe on a scope
   the slave contending with the push-pull during the ACK

   The output structure of the GPIO for I2C needs to be open
   drain.  When left at the default, one can observe on a scope
   the slave contending with the push-pull during the ACK

   The output structure of the GPIO for I2C needs to be open
   drain.  When left at the default, one can observe on a scope
   the slave contending with the push-pull during the ACK

Fix errors introduced into Kinetis serial when I unsuccessfully tried to correct coding standard violations.  Folks, things will be better for everyone if you just follow that standard.

wireless/ieee802154: Fixes ieee802154_data_ind_s

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

STM32L4: add support for many new MCUs from STM32L4X3XX product line and Nucleo-L452 board

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

Removes radio IOCTL.  Starts bringing radio and MAC closer with well-defined interface.

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

wireless/ieee802154: Removes radio IOCTL.  Starts bringing radio and MAC closer with well-defined interface.

configs/nucleo-l496zg: Kconfig was copied from nucleo-144

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

Removed as most options have not been tested.

(This also removes DPFPU/DTCM/ITCM features again, fixing a
recent git history hickup.)