ti816x: Enable ethernet support

The ti816x SoC revision of the ethernet IP block is handled by the
"davinci_emac" driver, rather than the "cpsw" driver as done by later
members of the family.  Enable the relevant plumbing.

Signed-off-by: Sriramakrishnan <srk@ti.com>
Signed-off-by: Vitaly Wool <vitaly.wool@konsulko.com>
Signed-off-by: Tom Rini <trini@konsulko.com>

configs/ti816x_evm_defconfig

@@ -35,6 +35,11 @@ CONFIG_OF_CONTROL=y
 CONFIG_DM=y
 CONFIG_DM_GPIO=y
 CONFIG_DM_I2C=y
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_MII=y
+CONFIG_CMD_PING=y
+CONFIG_CMD_EXT2=y
+CONFIG_CMD_FAT=y
 CONFIG_MMC_OMAP_HS=y
 CONFIG_SYS_NS16550=y
 # CONFIG_USE_PRIVATE_LIBGCC is not set