Remove the non-existent rt2860 subdir. Note, the ralfw module is not used in the build yet.
Remove the non-existent rt2860 subdir. Note, the ralfw module is not used in
the build yet.

PR:		kern/125015
Submitted by:	Dan Cojocar

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase