ARM: dts: omap4-droid4: Fix WLAN compatible

Motorola Droid 4 uses a WL1285C, so use proper compatible value.
To avoid regressions while support for the new compatible value
is added to the Linux kernel, the old compatible value is preserved
as fallback.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
Signed-off-by: Tony Lindgren <tony@atomide.com>