add the test_rgb_lcd sample program
add the test_rgb_lcd sample program

Signed-off-by: Grant Likely <9069e6f5a2b566e2674a0ba1e2bf39c12c195fad@linaro.org>

96boards/Starter_Kit_for_96Boards,96boards/Starter_Kit_for_96Boards,96boards/Sensor_Mezzanine_Getting_Started,96boards/Sensor_Mezzanine_Getting_Started