samsung-j3nxlte: port improvements
Changes:
- Depends on soc-sprd-audio-sc8830 package for audio support
- Includes fixes for X11 and color mode
- Switches to dtbtool-sprd
P.S. It appears that the device codename has a typo and must be named samsung-j3xnlte
. I'm going to make a separate MR related to this, but can make changes in this one instead if needed.