rmmod: Add rmmod command
rmmod: Add rmmod command

Allow loaded modules to be unloaded.

Limitations: Currently delete_module(2) is always called with
flags == O_NONBLOCK. This is a sane default, but other (to implement)
command flags should then set them accordingly.

Signed-off-by: Roland Kammerer <fc1b6c555e62f23cda4483d0e5d86d0756465080@gmail.com>

rminnich/u-root,GanShun/u-root,u-root/u-root,hugelgupf/u-root,u-root/u-root,rminnich/u-root,rminnich/u-root,GanShun/u-root,hugelgupf/u-root,u-root/u-root,GanShun/u-root,hugelgupf/u-root,hugelgupf/u-root,rminnich/u-root