Merged in w8jcik/nuttx/w8jcik/option-to-enable-memory-card-debug-outpu-1488183957218 (pull request #224)

Kconfig: memory card debug output without SDIO

Approved-by: Gregory Nutt

Provide a user defined callback context for irq's, such that when
registering a callback users can provide a pointer that will get
passed back when the isr is called.

SAM3/4: GPIO bit numbering typo fixes.

Approved-by: Gregory Nutt

Add basic support for the STM32F334 and Nucleo F334R8 board

Approved-by: Gregory Nutt

Kinetis:  Resolve issue with duplicate definitions of up_putc.  Addition conditional logic to pick just one.