ARM: dts: Fix hsi gdd range for omap4

While reviewing the missing mcasp ranges I noticed omap4 hsi range
for gdd is wrong so let's fix it.

I'm not aware of any omap4 devices in mainline kernel though that use
hsi though.

Fixes: 84badc5e ("ARM: dts: omap4: Move l4 child devices to probe
them with ti-sysc")
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>