net: Remove extraneous dependencies

With DM_ETH being required now for all drivers, we don't need this
listed on individual drivers as well.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 13e434e..db61c27 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -1,7 +1,6 @@
 source "drivers/net/phy/Kconfig"
 source "drivers/net/pfe_eth/Kconfig"
 source "drivers/net/fsl-mc/Kconfig"
-source "drivers/net/bnxt/Kconfig"
 
 config ETH
 	def_bool y
@@ -175,6 +174,8 @@
 	help
 	  This driver supports the BCMGENET Ethernet MAC.
 
+source "drivers/net/bnxt/Kconfig"
+
 config CORTINA_NI_ENET
 	bool "Cortina-Access Ethernet driver"
 	depends on CORTINA_PLATFORM
@@ -721,7 +722,6 @@
 config MPC8XX_FEC
 	bool "Fast Ethernet Controller on MPC8XX"
 	depends on MPC8xx
-	depends on DM_ETH
 	select MII
 	select SYS_DISCOVER_PHY
 	help