Update the documentation (sysfs-bus-greybus) for recent conversion of bridged-phy drivers to real drivers. Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Tested-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>