arm64: zynqmp: Describe TI phy as ethernet-phy-id

arm64: zynqmp: Describe TI phy as ethernet-phy-id

TI DP83867 is using strapping based on MIO pins. Tristate setup can influce
PHY address. That's why switch description with ethernet-phy-id compatible
string which enable calling reset. PHY itself setups phy address after
power up or reset. Reset description will be added in separate commit.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/52bf9ac0453d4e4896d8edd2618e684bb1ff6012.1662721547.git.michal.simek@amd.com