sunxi: A64: Update sun50i-a64-ccu.h

Update sun50i-a64-ccu.h from the Linux sunxi/dt64-for-4.20 tree:
commit 679294497be31596e1c9c61507746d72b6b05f26
Author: Rodrigo Exterckötter Tjäder <rodrigo@tjader.xyz>
Date:   Wed Sep 26 19:48:24 2018 +0000
    arm64: dts: allwinner: a64: a64-olinuxino: set the PHY TX delay

This should be a part of previous sync patch from
commit 1b39a183
Author: Andre Przywara <andre.przywara@arm.com>
Date:   Mon Oct 29 00:56:47 2018 +0000

    sunxi: A64: Update .dts/.dtsi files

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>