mips: ocelot: Enable use of serial gpio for LED

This enables the use of the MSCC serial GPIO driver to control the
LEDs on the MSCC VCoreIII 'ocelot' pcb123 and pcb120.

Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
diff --git a/configs/mscc_ocelot_defconfig b/configs/mscc_ocelot_defconfig
index 6645100..fb6a5bd 100644
--- a/configs/mscc_ocelot_defconfig
+++ b/configs/mscc_ocelot_defconfig
@@ -48,6 +48,9 @@
 CONFIG_DM_GPIO=y
 CONFIG_MTD=y
 CONFIG_MTD_SPI_NAND=y
+CONFIG_MSCC_SGPIO=y
+CONFIG_LED=y
+CONFIG_LED_GPIO=y
 CONFIG_DM_SPI_FLASH=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_BAR=y