Tiva Ethernet: Integrate use of workqueue so the network processing is not done at the interrupt level

Tiva Ethernet:  First cut at TM4C129X Ethernet driver.  Initial commit is basically just the STM32 Ethernet driver with modifications for a clean compilation in the Tiva environment

Signed-off-by: Marco Krahl <ocram.lhark@gmail.com>

stm32f429i-disco: change ltdc initializing during boot up. This moves initializing of the ili9341 lcd and ltdc driver to the board specific initializing routine.

Signed-off-by: Marco Krahl <ocram.lhark@gmail.com>

Signed-off-by: Marco Krahl <ocram.lhark@gmail.com>

stm32: fix faulty access to non existing layer.  This disables operation that requires double layer support, when configured for single layer only.

Signed-off-by: Marco Krahl <ocram.lhark@gmail.com>

STM32F429i-Disco USB:  Strangeness: Conditioned on OTGHS but called otgfs initialize routines.  Must be something broken