of: Drop superfluous dependance for OF_OVERLAY

The whole menu already depends on OF, so there is no need to additionaly specify it.

Suggested-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru>
Signed-off-by: Rob Herring <robh@kernel.org>
diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index 3876fb9..7bcaeec 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -85,7 +85,6 @@
 
 config OF_OVERLAY
 	bool "Device Tree overlays"
-	depends on OF
 	select OF_DYNAMIC
 	select OF_RESOLVE