gnuradio-dev-image : Drop .debug packages.

I am impatient. This means images are smaller and the write to SD
card is faster. If you need the debug stuff, add the feature back.

Signed-off-by: Philip Balister <philip@balister.org>
uhd : Update to 3.6.2-rc2.

 * Use uhd_images_downloader to get fpga until finaly release.
 * No longer use a .inc file.
 * Fixes for oe-core cmake changes.

Signed-off-by: Philip Balister <philip@balister.org>
gnuradio : Updates for oe-core cmake changes.

Signed-off-by: Philip Balister <philip@balister.org>
gr-osmosdr : Updates for oe-core cmake changes.

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