u-boot-e300 : Remove uneeded file.

Signed-off-by: Philip Balister <philip@balister.org>
ettus-e300 : Define files needed to create a bootable SD card.

Signed-off-by: Philip Balister <philip@balister.org>
u-boot-xlnx : Add uEnv.txt file to boot e300 from SD card.

Signed-off-by: Philip Balister <philip@balister.org>
ettus-e300 : Fix config options after recent meta-xilinx update.

Signed-off-by: Philip Balister <philip@balister.org>