Update u-boot to latest git HEAD. - arm-sdk - os build toolkit for various embedded devices

commit f4573a28bf17d1f07e06b7a8c69d1a2a13c6dd17
parent 4b036dec4a48803a47b01bdbc01571556f9f7170
Author: parazyd <parazyd@dyne.org>
Date:   Mon, 25 Jun 2018 15:09:10 +0200

Update u-boot to latest git HEAD.

	arm-sdk os build toolkit for various embedded devices
	git clone https://git.parazyd.org/arm-sdk
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