google-veyron-jerry: new device

Wiki page: https://wiki.postmarketos.org/wiki/Google_Veyron_Jerry_Chromebook_(google-veyron-jerry)

booting postmarketos on veyron_jerry. I was just messing with this over my weekend and thought i should put this here in case its useful or if someone wants to help get it mergeable

it boots and x11 ui's work so far. wifi works with linux-firmware-mrvl installed. i havent figured out the bootloader situation yet. right now i have u-boot in a kern partition on emmc, but i plan to figure out putting u-boot on spi to replace the stock depthcharge. got mainline unpatched u-boot on spi working. next step is adding a package for building that and add install instructions to wiki?

this also should work on other veyron variants by using a different dtb. -o i should probably change the device name, but i wasnt sure what it should be when i started renamed to google-veyron_jerry and made a wiki page for it.