powerpc/8xxx: Add fdt_fixup_phy_connection helper

Add a common helper that will set the PHY connection type based on enum.
We use this on eTSEC, UCC, and will with Fman in the future.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/include/asm/fsl_enet.h b/arch/powerpc/include/asm/fsl_enet.h
index 8596157..4fb2857 100644
--- a/arch/powerpc/include/asm/fsl_enet.h
+++ b/arch/powerpc/include/asm/fsl_enet.h
@@ -28,4 +28,6 @@
 	FSL_ETH_IF_NONE,
 };
 
+int fdt_fixup_phy_connection(void *blob, int offset, enum fsl_phy_enet_if phyc);
+
 #endif /* __ASM_PPC_FSL_ENET_H */