Use is_power_of_2() in myri10ge/myri10ge.c

Replace (n & (n-1)) with is_power_of_2()

Signed-off-by: vignesh babu <vignesh.babu@wipro.com>
Cc: Brice Goglin <brice@myri.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>