Staging/bcm: Fix whitespace/comments in Ioctl.h

Cleanup whitespace and comments in Ioctl.h in a few ways:
- > 80 character cleanup
- Comment clarification
- More consistent vertical alignment

Signed-off-by: Martin Kelly <martkell@amazon.com>
Reviewed-by: Matthias Beyer <mail@beyermatthias.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>