am335x, guardian: boot stage feedback in headless mode

This patch enables the guardian board to provide feedback
  about the boot stage in headless mode. The on-board led
  would behave in the following pattern

    * U-boot -> GLOW LED
    * Linux  -> BLINK LED [HEART-BEAT PATTERN]

Signed-off-by: Moses Christopher <BollavarapuMoses.Christopher@in.bosch.com>
diff --git a/configs/am335x_guardian_defconfig b/configs/am335x_guardian_defconfig
index eb2d221..942530d 100644
--- a/configs/am335x_guardian_defconfig
+++ b/configs/am335x_guardian_defconfig
@@ -37,6 +37,7 @@
 CONFIG_CMD_SPL_NAND_OFS=0x0
 CONFIG_CMD_ASKENV=y
 # CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_LED is not set
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_I2C=y
@@ -58,6 +59,8 @@
 CONFIG_SPL_DM=y
 CONFIG_BOOTCOUNT_LIMIT=y
 CONFIG_BOOTCOUNT_ENV=y
+CONFIG_LED=y
+CONFIG_LED_GPIO=y
 CONFIG_MISC=y
 # CONFIG_MMC is not set
 CONFIG_MTD=y