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

commit db67c16c73d452f4b2ac03c14be415eda63d41e4
parent d56486e84944ab03079d65acb09f60d2227e6751
Author: parazyd <parazyd@dyne.org>
Date:   Sun,  7 Oct 2018 19:33:50 +0200

Update u-boot to latest git master

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