net/phy: fix DP83865 10 Mbps HDX loopback disable function

net/phy: fix DP83865 10 Mbps HDX loopback disable function

commit e47488b2df7f9cb405789c7f5d4c27909fc597ae upstream.

According to the DP83865 datasheet "the 10 Mbps HDX loopback can be
disabled in the expanded memory register 0x1C0.1". The driver erroneously
used bit 0 instead of bit 1.

Fixes: 4621bf129856 ("phy: Add file missed in previous commit.")
Signed-off-by: Peter Mamonov <pmamonov@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>