Revert "arm: sun8i: orangepi-pc-plus: Set EMAC activity LEDs to active high"

This reverts commit 75ee680c.

Turns out the activity and link LEDs on the RJ45 port are active low,
just like on the Orange Pi PC.

Revert the commit that says otherwise.

Fixes: 75ee680c ("arm: sun8i: orangepi-pc-plus: Set EMAC activity LEDs to active high")
Fixes: 4904337f ("ARM: dts: sunxi: Restore EMAC changes (boards)")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Tested-by: Jernej Skrabec <jernej.skrabec@siol.net>
Acked-by: Jernej Skrabec <jernej.skrabec@siol.net>
Link: https://lore.kernel.org/r/20201024162515.30032-1-wens@kernel.org