net/cadence_gem: Improve can_receive debug printfery
Currently this just floods indicating that can_receive has been called
by the net framework. Instead, save the result of the most recent
can_receive callback as state and only print a message if the result
changes (indicating some sort of actual state change in GEM). Make said
debug message more meaningful as well.
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id:
2eb74ca6a5756aea242d9f525961db95d6cfcf2c.
1386136219.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>