sunxi: Fix USB PHY index for H3

This patch update the USB PHY index for Allwinner H3.

Same change[1] initially sent, by 'Chen-Yu Tai' but missed
to apply due to recursive version changes on the same series.

[1] https://lists.denx.de/pipermail/u-boot/2018-January/318817.html



Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>