device-samsung-herolte: new device (Samsung Galaxy S7) (!314)

This is basically just the packages for the Galaxy S7 Edge (hero2lte).
I only needed to change a few Kernel config options, so that the
colors are displayed correctly. The options regarding
CONFIG_PANEL_S6E3HF4_WQHD and CONFIG_PANEL_S6E3HA3_DYNAMIC probably
solve this issue, but I modified the other options as well. I got the
differences by diffing:
arch/arm64/configs/exynos8890-{hero2lte,herolte}_defconfig

Booting, USB networking and the display work! I can't say anything about
flashing via heimdall as this tool scares me. Following what WilliamO7
wrote on the device page, I flashed it by sideloading the android
recovery zip.

[ci:skip-build]: already built successfully in CI