device-xiaomi-tissot: Initial device support

Initial support for Xiaomi A1 aka xiaomi-tissot using LineageOS 15.1 kernel, has similar board to Xiaomi Redmi 4 aka xiaomi-mido with some differences that had to be patched such as reversing skip_initramfs and ignoring dm param. 16.0 kernel boots but display fb init doesn't work.

Works:

• USB RNDIS with SSH (applied a patch to only WARN_ON once instead of dmesg spam which is only triggered when USB network is active)
• Display with Wayland: Weston and Plasma (software rendering)
• Touchscreen with several fingers
• reboot/poweroff

Kinda works:

• Display with Xorg after issuing the command cat /sys/class/graphics/fb0/modes > /sys/class/graphics/fb0/mode, for some reason none of hacks related to mdss/msm fb works because the command has to be issued after some time and then Xorg must be started. Xorg without this trick reports "FBIOPUT_VSCREENINFO: Invalid argument"... Any idea?
• Already plugged USB devices via OTG/Host when kernel is booting

Requires firmware:

• WiFi
• Baseband (probably)

Not working:

• Bluetooth (kernel doesn't report any error and shows device but rfkill is empty)
• WiFi
• Audio
• New USB devices via OTG/Host after boot
• Baseband

device/device-xiaomi-tissot/APKBUILD

+# Reference: <https://postmarketos.org/devicepkg>
+pkgname="device-xiaomi-tissot"
+pkgdesc="Xiaomi A1"
+pkgver=0.1
+pkgrel=0
+url="https://postmarketos.org"
+license="MIT"
+arch="aarch64"
+options="!check !archcheck"
+depends="postmarketos-base linux-xiaomi-tissot mkbootimg mesa-dri-swrast msm-fb-refresher"
+makedepends="devicepkg-dev"
+source="deviceinfo
+"
+
+build() {
+	devicepkg_build $startdir $pkgname
+}
+
+package() {
+	devicepkg_package $startdir $pkgname
+}
+
+sha512sums="176aa6496dd4bc335fec4ba986348390b60233ba303d3b170650dbe3020e2a15438ca8708f2d9e5fc92e9dc8f3301fe7ba0f8840e953e4591a7bd7da22c0b459  deviceinfo"