mtd: nand: davinci: move bindings under mtd

Move bindings under mtd. Do this in order to make davinci-nand
driver usable by keystone architecture.

Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Taras Kondratiuk <taras@ti.com>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/Documentation/devicetree/bindings/arm/davinci/nand.txt b/Documentation/devicetree/bindings/mtd/davinci-nand.txt
similarity index 100%
rename from Documentation/devicetree/bindings/arm/davinci/nand.txt
rename to Documentation/devicetree/bindings/mtd/davinci-nand.txt