samples: gpio: lcd: sample app for HD44780 LCD controller

    Display text strings on parallel interfacing HD44780 based
    generic LCD controller using GPIO pins to interface with
    Arduino Due(SAM3). HD44780 is a popular controller and an
    example can help using gpio pins in parallel with it. I
    have tested it on JHD20x4 LCD panel for 4Bits & 8Bits
    configuration. The code has been made generic so that user
    can modify quite a few options.

    Datasheets:
        http://lcd-linux.sourceforge.net/pdfdocs/hd44780.pdf



Signed-off-by: Milind Deore <tomdeore@gmail.com>
Change-Id: If2809222466b462fa2f4c42b14a514828530f082