Add DragonBoard-410c as target board

Add DragonBoard-410c as target board

This patch adds the dragonboard-410c as DragonBoard-410c target.

There are instructions to write image into eMMC and boot system at:
https://github.com/96boards/documentation/wiki/Dragonboard-410c-Installation-Guide-for-Linux-and-Android#flash-the-bootloader-into-on-board-emmc

v2: Rebase after merge conflict (jsmoeller)
v3: Generalize the eula script into function to be reuseable (jsmoeller)

Depends-On: Idcad2c27539af130704a3c66efe6b91868eef534
Change-Id: I52e5d732c865989796158016758e6e745c74cac8
Signed-off-by: Kotaro Hashimoto <Hashimoto.Kotaro@ds.MitsubishiElectric.co.jp>
Signed-off-by: Jan-Simon Möller <jsmoeller@linuxfoundation.org>