Add wandboard-quad-custom machine

Signed-off-by: Alex Gonzalez <alex.gonzalez@digi.com>
Add u-boot-fslc append

Signed-off-by: Alex Gonzalez <alex.gonzalez@digi.com>
Add kernel bbappend

Signed-off-by: Alex Gonzalez <alex.gonzalez@digi.com>
Add hello world kernel module example

Signed-off-by: Alex Gonzalez <alex.gonzalez@digi.com>