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

commit b58307b6e584a6179c5e3c36288c631936d28ec3
parent 3db5cfd6ed9c7fe4fe4fb7a2e4e9a80331141ecf
Author: parazyd <parazyd@dyne.org>
Date:   Tue, 12 Jun 2018 13:28:05 +0200

Sync u-boot submodule to latest HEAD.

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