[PlatformWithOS] fix for remove target

Signed-off-by: Christopher Hall <christopherhall.hsw@gmail.com>
[PlatformWithOS] document the setup of SD Card for Beagle Bone Black

How to create an SD card of Angstrom to begin debugging the EPD
driver on this system.  These are only preliminary instructions.

Signed-off-by: Christopher Hall <christopherhall.hsw@gmail.com>