of_net: Fix residues after of_get_nvmem_mac_address removal

I've discovered following discrepancy in the bindings/net/ethernet.txt
documentation, where it states following:

 - nvmem-cells: phandle, reference to an nvmem node for the MAC address;
 - nvmem-cell-names: string, should be "mac-address" if nvmem is to be..

which is actually misleading and confusing. There are only two ethernet
drivers in the tree, cadence/macb and davinci which supports this
properties.

This nvmem-cell* properties were introduced in commit 9217e566
("of_net: Implement of_get_nvmem_mac_address helper"), but
commit afa64a72 ("of: net: kill of_get_nvmem_mac_address()")
forget to properly clean up this parts.

So this patch fixes the documentation by moving the nvmem-cell*
properties at the appropriate places.  While at it, I've removed unused
include as well.

Cc: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Fixes: afa64a72 ("of: net: kill of_get_nvmem_mac_address()")
Signed-off-by: Petr Štetiar <ynezz@true.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/davinci_emac.txt

@@ -20,6 +20,8 @@ Required properties:
 Optional properties:
 - phy-handle: See ethernet.txt file in the same directory.
               If absent, davinci_emac driver defaults to 100/FULL.
+- nvmem-cells: phandle, reference to an nvmem node for the MAC address
+- nvmem-cell-names: string, should be "mac-address" if nvmem is to be used
 - ti,davinci-rmii-en: 1 byte, 1 means use RMII
 - ti,davinci-no-bd-ram: boolean, does EMAC have BD RAM?
 

Documentation/devicetree/bindings/net/ethernet.txt

@@ -10,8 +10,6 @@ Documentation/devicetree/bindings/phy/phy-bindings.txt.
   the boot program; should be used in cases where the MAC address assigned to
   the device by the boot program is different from the "local-mac-address"
   property;
-- nvmem-cells: phandle, reference to an nvmem node for the MAC address;
-- nvmem-cell-names: string, should be "mac-address" if nvmem is to be used;
 - max-speed: number, specifies maximum speed in Mbit/s supported by the device;
 - max-frame-size: number, maximum transfer unit (IEEE defined MTU), rather than
   the maximum frame size (there's contradiction in the Devicetree

Documentation/devicetree/bindings/net/macb.txt

@@ -26,6 +26,10 @@ Required properties:
 	Optional elements: 'tsu_clk'
 - clocks: Phandles to input clocks.
 
+Optional properties:
+- nvmem-cells: phandle, reference to an nvmem node for the MAC address
+- nvmem-cell-names: string, should be "mac-address" if nvmem is to be used
+
 Optional properties for PHY child node:
 - reset-gpios : Should specify the gpio for phy reset
 - magic-packet : If present, indicates that the hardware supports waking

drivers/of/of_net.c

@@ -7,7 +7,6 @@
  */
 #include <linux/etherdevice.h>
 #include <linux/kernel.h>
-#include <linux/nvmem-consumer.h>
 #include <linux/of_net.h>
 #include <linux/phy.h>
 #include <linux/export.h>