Also start squashing the .mdt files into .mbn and provide compatibility
symlinks so old kernels that look for .mdt still find it.
Also move the zap firmware into a device-specific subdirectory.
Symlinks for venus are skipped since that one's not used in any
production branch yet for sm7225.
[ci:skip-build]: Already built successfully in CI.
Luca Weiss
8b8c03461b