net: axienet: remove unnecessary parentheses

Remove unnecessary parentheses around 'ndev->mtu
<= XAE_JUMBO_MTU' and 'ndev->mtu > XAE_MTU'. Reported
by checkpatch.

CHECK: Unnecessary parentheses around 'ndev->mtu > XAE_MTU'
+       if ((ndev->mtu > XAE_MTU) &&
+           (ndev->mtu <= XAE_JUMBO_MTU)) {

CHECK: Unnecessary parentheses around 'ndev->mtu <= XAE_JUMBO_MTU'
+       if ((ndev->mtu > XAE_MTU) &&
+           (ndev->mtu <= XAE_JUMBO_MTU)) {

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>