configs: k2hk_evm: add random eth address support

There is only one ethernet mac address in e-fuse, but there are
multiple slaves in keystone net, so enable random mac address
support.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/k2hk_evm_defconfig b/configs/k2hk_evm_defconfig
index 8623e1c..c050f07 100644
--- a/configs/k2hk_evm_defconfig
+++ b/configs/k2hk_evm_defconfig
@@ -37,3 +37,5 @@
 CONFIG_USB=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_DWC3=y
+CONFIG_LIB_RAND=y
+CONFIG_NET_RANDOM_ETHADDR=y