net: phy: Don't limit phy addresses by default

Some boards expect to find more than one phy while other boards are old
and need to be limited to a specific phy address. Only limit the phy
address for boards that opt in.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/configs/devkit3250_defconfig b/configs/devkit3250_defconfig
index fa35748..a88cf1c 100644
--- a/configs/devkit3250_defconfig
+++ b/configs/devkit3250_defconfig
@@ -36,6 +36,7 @@
 CONFIG_NAND=y
 CONFIG_SPL_NAND_SIMPLE=y
 CONFIG_PHYLIB=y
+CONFIG_PHY_ADDR_ENABLE=y
 CONFIG_PHY_ADDR=31
 CONFIG_DM_SERIAL=y
 CONFIG_SYS_NS16550=y