configs: davinci: omapl138_lcdk: add random eth address support

Any TFTP or DHCP boot on the Davinci OMAP-L138 LCDK board requires
that the 'ethaddr' variable be defined. There are no e-fuses to store
the ethernet mac address for this platform, and neither is a MAC
address reserved in any format. So enable random MAC address support
so that networking boot can be supported.

Signed-off-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
diff --git a/configs/omapl138_lcdk_defconfig b/configs/omapl138_lcdk_defconfig
index cb351e4..b5d14d2 100644
--- a/configs/omapl138_lcdk_defconfig
+++ b/configs/omapl138_lcdk_defconfig
@@ -24,6 +24,7 @@
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_CMD_DIAG=y
 CONFIG_CMD_UBI=y
+CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_SYS_NAND_U_BOOT_LOCATIONS=y
 CONFIG_SYS_NAND_U_BOOT_OFFS=0x28000
 CONFIG_SPI_FLASH=y