xilinx: Enable led support for some boards

Enable led support for boards which have "gpio-leds" node.
And also for microblaze which is converted to DM_GPIO now.
Tested on zcu100.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/microblaze-generic_defconfig b/configs/microblaze-generic_defconfig
index b1d0193..4917d47 100644
--- a/configs/microblaze-generic_defconfig
+++ b/configs/microblaze-generic_defconfig
@@ -41,6 +41,8 @@
 CONFIG_SPL_DM=y
 CONFIG_DM_GPIO=y
 CONFIG_XILINX_GPIO=y
+CONFIG_LED=y
+CONFIG_LED_GPIO=y
 CONFIG_MTD_NOR_FLASH=y
 CONFIG_PHY_ATHEROS=y
 CONFIG_PHY_BROADCOM=y