ARM: dts: sun7i: lamobo-r1: Fix GPIO flags in reg_ahci_5v

reg_ahci_5v uses a GPIO in active high mode. Use the proper macro,
instead of just 0 for the GPIO flags.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>