ARM: dts: Fix typo in regulator enable GPIO property in s5pv210-goni

The property name should be "gpio", not "gpios". Fix it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kukjin Kim <kgene@kernel.org>