configs: am65x_evm_a53: Enable config for phandle check while getting sequence number

AM65x SoC has two USB subsystems and their corresponding device tree nodes
have the same name but different path. While allocating sequence numbers
for these device tree nodes using alias, phandles can be used to
distinguish them.

Enable config for phandle check while getting sequence number to
distinguish the USB device tree nodes.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>