of: remove select of non-existant OF_DEVICE config symbol

The OF_OVERLAY option selects OF_DEVICE, but OF_DEVICE was removed in
commit ba166e90, "of: remove CONFIG_OF_DEVICE". Remove the unnecessary
select.
Signed-off-by: Grant Likely <grant.likely@linaro.org>
Reported-by: Paul Bolle <pebolle@tiscali.nl>
Cc: Pantelis Antoniou <pantelis.antoniou@konsulko.com>

drivers/of/Kconfig

@@ -88,7 +88,6 @@ config OF_OVERLAY
 	bool
 	depends on OF
 	select OF_DYNAMIC
-	select OF_DEVICE
 	select OF_RESOLVE
 
 endmenu # OF