net: phy: icplus: fix broken INTR pin settings

This patch fixes the setting of the INTR pin that is
valid for IP101 A/G device and not for the IP1001.

Reported-by: Anunay Saxena <anunay.saxena@st.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>