sunxi: restore PHYLIB for CONFIG_SUN4I_EMAC users

due misnaming of CONFIG_SUN4I_EMAC in include/configs/sunxi-common.h,
likely missed in:
	commit 3146f0c017df ("Move PHYLIB to Kconfig")

Signed-off-by: Artturi Alm <artturi.alm@gmail.com>
Reviewed-by: Jagan Teki <jagan@openedev.com>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index c1ce54e..52555da 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -247,6 +247,7 @@
 config SUN4I_EMAC
 	bool "Allwinner Sun4i Ethernet MAC support"
 	depends on DM_ETH
+	select PHYLIB
 	help
 	  This driver supports the Allwinner based SUN4I Ethernet MAC.