sandbox: eth-raw: Add a SIMPLE_BUS to enumerate host interfaces

Ask the OS for each of its interfaces and for each one, bind a U-Boot
device and then probe it. This will allocate the priv data structure
that is then populated.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 058dd00..c1ed44e 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -50,6 +50,7 @@
 obj-$(CONFIG_RTL8169) += rtl8169.o
 obj-$(CONFIG_ETH_SANDBOX) += sandbox.o
 obj-$(CONFIG_ETH_SANDBOX_RAW) += sandbox-raw.o
+obj-$(CONFIG_ETH_SANDBOX_RAW) += sandbox-raw-bus.o
 obj-$(CONFIG_SH_ETHER) += sh_eth.o
 obj-$(CONFIG_RENESAS_RAVB) += ravb.o
 obj-$(CONFIG_SMC91111) += smc91111.o