ARM: dts: sun8i: r40: Fix AHCI reset-names property

The AHCI node was introduced with a typo in the reset-names property that
got written resets-name instead.

This was working because the reset is optional for that driver, and the
controller was put out of reset by the bootloader.

Fixes: 41c64d33 ("ARM: dts: sun8i: r40: add sata node")
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>