dpaa_eth: use false and true for bool variables

Fix coccicheck warnings:

./dpaa_eth.c:2549:2-22: WARNING: Assignment of 0/1 to bool variable
./dpaa_eth.c:2562:2-22: WARNING: Assignment of 0/1 to bool variable

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zou Wei <zou_wei@huawei.com>
Acked-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Link: https://lore.kernel.org/r/1604405100-33255-1-git-send-email-zou_wei@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>