Squashed commit of the following:

    stm3240g-eval:  Add a configuration for testing the FB character driver at drivers/video/fb.c using the LCD frame driver front end at drivers/lcd/lcd_framebuffer.c.  Appears to be fully functional.

    stm3240g-eval:  Replace the old-style stm32_appinit.c with tne new one from the STM32F4-Discovery

    stm3240g-eval:  Rename stm32_appinit.c to stm32_bringup.c to better match other architectures