renesas_rzg2l_smarc_defconfig: Enable networking support

For Ethernet to work on the RZ/G2L board, we need to enable support for
the ksz9131 PHY and enable random MAC address generation (as no MAC
address is programmed into the board).

We also enable the `dhcp`, `mii` and `ping` commands so that Ethernet
functionality can be tested and used to boot Linux.

Signed-off-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
diff --git a/configs/renesas_rzg2l_smarc_defconfig b/configs/renesas_rzg2l_smarc_defconfig
index b1d970b..6ec1512 100644
--- a/configs/renesas_rzg2l_smarc_defconfig
+++ b/configs/renesas_rzg2l_smarc_defconfig
@@ -27,6 +27,9 @@
 CONFIG_CMD_MMC=y
 CONFIG_CMD_PART=y
 CONFIG_CMD_USB=y
+CONFIG_CMD_DHCP=y
+CONFIG_CMD_MII=y
+CONFIG_CMD_PING=y
 CONFIG_CMD_PMIC=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
@@ -41,6 +44,7 @@
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
 CONFIG_SYS_MMC_ENV_PART=2
 CONFIG_VERSION_VARIABLE=y
+CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_REGMAP=y
 CONFIG_CLK=y
 CONFIG_CLK_RENESAS=y
@@ -50,6 +54,8 @@
 CONFIG_MMC_IO_VOLTAGE=y
 CONFIG_MMC_UHS_SUPPORT=y
 CONFIG_MMC_HS400_SUPPORT=y
+CONFIG_PHY_MICREL=y
+CONFIG_PHY_MICREL_KSZ90X1=y
 CONFIG_DM_PMIC=y
 CONFIG_PMIC_RAA215300=y
 CONFIG_DM_REGULATOR=y