1) Shifted the clock speed of MK20DX128VLH5 to 48 Mhz to be
      able to uses USB.
   2) Set BOARD_OUTDIV3 to 0 - there is no BOARD_OUTDIV3 on a
      MK20DX128VLH5 or K20DX256VLH7

   3) Added BOARD_SOPT2_PLLFLLSEL and BOARD_SOPT2_FREQ along with
      settings for BOARD_SIM_CLKDIV2_USBFRAC and
      BOARD_SIM_CLKDIV2_USBDIV base on the BOARD_SOPT2_FREQ.

  1) Removed SIM_CLKDIV2[USBFRAC, USBDIV] setting as it is now
     done in kinetis_clockconfig
  2) Use BOARD_USB_CLKSRC to select the clock source to the
     USB block
  3) Removed warning
  4) Removed CONFIG_TEENSY_3X_OVERCLOCK from the driver as
     the board.h will now provide BOARD_SIM_CLKDIV2_USBDIV
     and BOARD_SIM_CLKDIV2_USBFRAC to the kinetis_clockconfig

  If a board.h provides BOARD_SIM_CLKDIV2_FREQ it will configure the
  SIM_CLKDIV2 based on the additional provided
  BOARD_SIM_CLKDIV2_USBFRAC and BOARD_SIM_CLKDIV2_USBDIV

  The reason for doing this globaly is that the output the
  SIM_CLKDIV2 divisor may be also used for other IP blocks in
  future configurations (as is done for SIM_CLKDIV3)

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

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.

Kinetis:Add LPUART

Approved-by: Gregory Nutt

   Pin out LPUART0 for testing
   Define BOARD_SOPT2_PLLFLLSEL ti select MCGPLLCLK
   Define BOARD_SIM_CLKDIV3_FREQ etal to provide BOARD_LPUART0_FREQ

  HAVE_SERIAL_CONSOLE -> HAVE_UART_CONSOLE to bew consistent with
  HAVE_LPUART_CONSOLE naming

  A board.h file can now specify the:
   1) BOARD_SOPT2_PLLFLLSEL to select the output of the SIM_SOPT2 MUX
     from:
       MCGFLLCLK
       MCGPLLCLK
       USB1PFD
       IRC48MHZ

    2) If it defines BOARD_SIM_CLKDIV3_FREQ then it must define
    BOARD_SIM_CLKDIV3_PLLFLLFRAC and BOARD_SIM_CLKDIV3_PLLFLLDIV
    which wil be used to cpnfigure SIM_CLKDIV3 [PLLFLLFRAC, PLLFLLDIV]