Draft: huawei-venus: new device

Add Huawei P9 lite (venus) Using downstream kernel. Device boots, is accessible via ssh via usb, but the backlight is off

device/testing/linux-huawei-venus/APKBUILD

 # Reference: <https://postmarketos.org/vendorkernel>
-# Kernel config based on: arch/arm64/configs/(CHANGEME!)
+# Kernel config based on: arch/arm64/configs/merge_hi6250_defconfig
 
 pkgname=linux-huawei-venus
 pkgver=4.1.18