configs: net: convert DRIVER_TI_KEYSTONE_NET kconfig

Convert DRIVER_TI_KEYSTONE_NET to Kconfig.

Reviewed-by: Tom Rini <trini@konsulko.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
diff --git a/configs/k2hk_evm_defconfig b/configs/k2hk_evm_defconfig
index 8c7d362..f66d922 100644
--- a/configs/k2hk_evm_defconfig
+++ b/configs/k2hk_evm_defconfig
@@ -56,3 +56,4 @@
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_DWC3=y
 CONFIG_USB_STORAGE=y
+CONFIG_DRIVER_TI_KEYSTONE_NET=y