Display image selection for images with textlcd

When image has MACHINE_FEATURES textlcd it should write text
to lcd device. Also check if /dev/dbox/oled0 device exist.

In order to use it we need the following into EXTRA_OEMAKE
${@base_contains("MACHINE_FEATURES", "textlcd", "-DOMB_HAVE_TEXTLCD" , "", d)}
Merge pull request #4 from athoik/textlcd

Display image selection for images with textlcd