media_list tests for gigabit phys like this:
if (mask & BMCR_SPEED1000)
mask does not contain the value of the BMCR register though, so the
test is completely bogus. Test for mask2 instead which is only
nonzero when the phy has gigabit capabilities.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>