arm64: dts: meson-g12a: Remove 'enable-active-low'

The 'enable-active-low' property is not a valid one.

Only 'enable-active-high' is valid, and when this property is absent
the gpio regulator will act as active low by default.

Remove the invalid 'enable-active-low' property.

Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20220827203813.1742715-1-festevam@denx.de