msm89x7: Add mainline kernel and devices

This MR contains initial mainline support for msm89x7 (msm8917, msm8937, msm8940) devices.

New Packages:

• linux-postmarketos-qcom-msm89x7
• soc-qcom-msm89x7

New Devices:

• qcom-msm89x7

Ported from downstream:

• xiaomi-santoni (replaced with generic package)
• xiaomi-riva (replaced with generic package)

Supported devices with the generic device package:

msm8917 (upstreamed):

• Redmi 5A (xiaomi-riva) (upstreamed)
• Redmi Note 5A (xiaomi-ugglite)

msm8937:

• Redmi 3S (xiaomi-land) (custom lk2nd build is needed)

msm8940:

• Redmi 4X (xiaomi-santoni)
• Redmi Note 5A Prime (xiaomi-ugg)

TODO:

• make a stable branch at the kernel fork (msm8917 upstreaming is in progress)
• clarify the maintainers (are the old maintainers still active, is there anyone who want to be a maintainer)

Fixes: #3299 (closed)

!5603 (closed)

device/testing/soc-qcom-msm89x7/APKBUILD

+# Maintainer: Barnabas Czeman <barnabas.czeman@postmarketos.org>
+pkgname=soc-qcom-msm89x7
+pkgdesc="Common package for Qualcomm MSM89x7 devices"
+pkgver=1
+pkgrel=0
+url="https://postmarketos.org"
+license="BSD-3-Clause"
+arch="aarch64"
+options="!check !archcheck !tracedeps pmb:cross-native"
+depends="swclock-offset"
+subpackages="
+	$pkgname-gpu
+"
+
+source="
+	adreno-quirks.sh
+"
+
+package() {
+	mkdir -p $pkgdir
+}
+
+gpu() {
+	pkgdesc="Various GPU workarounds for Adreno 308 and 505"
+	install_if="$pkgname=$pkgver-r$pkgrel mesa-dri-gallium"
+
+	install -Dm644 "$srcdir"/adreno-quirks.sh \
+		"$subpkgdir"/etc/profile.d/adreno-quirks.sh
+}
+
+sha512sums="
+d54065bd6e069dd49349fc53960de42fa43438c4519e90a44d89ab6fdf74978301b1d3865bb4d51130806bf8680ce34532ad97b2729e78208745a1aa4bbac904  adreno-quirks.sh
+"