ARM: shmobile: alt: Correct ether pfc

22b160713cb6 ("ARM: shmobile: alt: Add pfc pins to DT") introduced pfc pins
to the alt device tree but did not reference them. This patch fixes ether
pfc by:

* Referencing ether pins
* Adding and referencing phy1 pins
* Removing ether b pins. These are not used in the configuration
  of the alt board used for testing and empirically their presence
  prevents ethernet from functioning correctly in that environment.

Reported-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7794-alt.dts

@@ -118,9 +118,9 @@
 		renesas,function = "eth";
 	};
 
-	ether_b_pins: ether {
-		renesas,groups = "eth_link_b", "eth_mdio_b", "eth_rmii_b";
-		renesas,function = "eth";
+	phy1_pins: phy1 {
+		renesas,groups = "intc_irq8";
+		renesas,function = "intc";
 	};
 
 	i2c1_pins: i2c1 {
@@ -139,6 +139,9 @@
 };
 
 &ether {
+	pinctrl-0 = <&ether_pins &phy1_pins>;
+	pinctrl-names = "default";
+
 	phy-handle = <&phy1>;
 	renesas,ether-link-active-low;
 	status = "okay";