This is already discussed in this forum post:
If you want the RAW file to display correctly in Lightroom Mobile, you need to add the camera profiles to Lightroom Desktop, and then sync those camera profiles to Lightroom Mobile.
You may find that this is still a bit hit or miss… I don’t believe there is a direct way in Lightroom Mobile to force the re-rendering of RAW files, so you may still see the previews be incorrect until you go in and edit them.
In general, I recommend making positive copies (either TIFF or JPEG) and then have just those synced to Lightroom Mobile for further adjustment (rather than syncing the RAWs).
-Nate