ARM: dts: r-mobile: Add missing Ethernet PHY resets

Describe all Ethernet PHY reset GPIOs on R-Mobile boards, to avoid
relying solely on boot loaders to bring PHYs out of reset.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/b41bf0098ff193fbff9fad04d00075ce1bea1986.1631177442.git.geert+renesas@glider.be