arm64: dts: rockchip: drop non-existent gmac2phy pinmux options from rk3328

When gmac2phy was added, a whole bunch of pinmux options were added.
Turns out some of these don't exist on the actual product, based on
the publicly available TRM.

Remove them.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Link: https://lore.kernel.org/r/20200327030414.5903-4-wens@kernel.org


Signed-off-by: Heiko Stuebner <heiko@sntech.de>