ARM: dts: omap3: Remove 'enable-active-low' property

Property 'enable-active-low' does not exist. Only 'enable-active-high' is
valid, and when this property is absent the gpio regulator will act as
active low by default.

So remove the unexisting 'enable-active-low' property.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>