Photon: add basic support for wlan chip

Approved-by: Gregory Nutt

STM32; OTG host implementations of stm32_in_transfer() must obey the polling interval for the case of isochronous and itnerrupt endpoints.

STM32 OTG HS:  A little research reveals that only the F2 RCC initialization set the OTGHSULPIEN bit and Photon is the only F2 board configuration that uses OTG .  Therefore, we can simplify the conditional logic of the last PR.  Negative logic was used (#ifndef BOARD_DISABLE_USBOTG_HSULPI) to prevent bad settings in other configurations.  But give these facts, the preferred positive logic now makes more sense (#ifdef BOARD_ENABLE_USBOTG_HSULPI).

STM32: Review of last STM32 F2 PR.  Progate changes to STM32 F4 and F7 OTGHS.  Rename some configs/photon/src files.  Naming can be either photon_ or stm32_ but must be consistent.

stm32f20xxx: add BOARD_DISABLE_USBOTG_HSULPI flag

Approved-by: Gregory Nutt

Merged in david_s5/nuttx-13/david_s5/as-discovered-by-dcabecinhas-this-fix-as-1489246417893 (pull request #264)

As discovered by dcabecinhas. This fix assume the 8 byte alignment options for size stack size or this will overwrite the first word after TOS

Approved-by: Gregory Nutt

As discovered by dcabecinhas. This fix assume the 8 byte alignment options for size stack size or this will overwrite the first word after TOS
See https://github.com/PX4/Firmware/issues/6613#issuecomment-285869778

photon: add usb otg hs support and usbnsh app

Approved-by: Gregory Nutt

photon: add iwdg timer support

Approved-by: Gregory Nutt

STM32 F33 ADC: Correct bad definitions of base addresses; Fix naming collision by changing colliding STM32_ADC12_BASE to STM32_ADC12_CMN_BASE

drivers/wireless/nrf24l01.c:  Review last PR.  Also got enthused and did major re-work to file to bring it closer to the NuttX coding style.  Fixed a few compile time warnings.

multiple fixes in nrf24l01 driver

Approved-by: Gregory Nutt

- signal POLLIN if there is already data in the FIFO
- send ETIMEDOUT to userspace after 2 seconds if TX IRQ was not received
- handle FIFO overflow
- handle invalid pipes/empty FIFO
- multiple cosmetics (missing static, duplicate define, missing \n)