Documentation: boards: stm32mp: document boot error LED
The STM32MP Evaluation Kits place a LED on PA13 to display boot status.
Document its blinking patterns.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@Ahmad Fatoum Ahmad Fatoum authored on 12 Nov 2019
Sascha Hauer committed on 13 Nov 2019
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Documentation/boards/stm32mp.rst