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Implement LED activity API similar to BOOT LED API. Usual activity might be a file transfer with TFTP, a flash write... User of this API will call led_activity_on/off/blink() to signal these kind of activity. New Kconfig is implemented similar to BOOT LED, LED_ACTIVITY to enable support for it. It's introduced a new /options/u-boot property "activity-led" and "activity-led-period" to define the activity LED label and the default period when the activity LED is set to blink mode. If "activity-led-period" is not defined, the value of 250 (ms) is used by default. If CONFIG_LED_BLINK or CONFIG_LED_SW_BLINK is not enabled, led_boot_blink call will fallback to simple LED ON. Signed-off-by: Christian Marangi <ansuelsmth@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>