linux-google-sargo: remove (MR 4146)

It doesn't build currently (issue 2146) and also it's not used by any
device package currently (with other ports we support selecting between
mainline and downstream kernel in some cases, but not here).

If it's useful, the build can be fixed and it can be added back in a
future patch.

device/testing/linux-google-sargo/APKBUILD

@@ -1,59 +0,0 @@
-# Reference: <https://postmarketos.org/vendorkernel>
-# Kernel config based on: arch/arm64/configs/bonito_defconfig
-
-pkgname=linux-google-sargo
-pkgver=4.9.292
-pkgrel=1
-pkgdesc="Google Pixel 3a kernel fork"
-arch="aarch64"
-_carch="arm64"
-_flavor="google-sargo"
-url="https://kernel.org"
-license="GPL-2.0-only"
-options="!strip !check !tracedeps pmb:cross-native"
-makedepends="
-	android-tools
-	bash
-	bc
-	bison
-	dtc
-	devicepkg-dev
-	flex
-	lz4
-	openssl-dev
-	perl
-"
-
-# Source
-_repository="android_kernel_google_msm-4.9"
-_commit="b72846a92eb2df2fe5c73dc1159292286f022258"
-_config="config-$_flavor.$arch"
-source="
-	$pkgname-$_commit.tar.gz::https://github.com/LineageOS/$_repository/archive/$_commit.tar.gz
-	$_config
-"
-builddir="$srcdir/$_repository-$_commit"
-_outdir="out"
-
-export MKDTIMG="mkdtboimg"
-
-prepare() {
-	default_prepare
-	. downstreamkernel_prepare
-}
-
-build() {
-	unset LDFLAGS
-	make O="$_outdir" ARCH="$_carch" CC="${CC:-gcc}" \
-		KBUILD_BUILD_VERSION="$((pkgrel + 1 ))-postmarketOS"
-}
-
-package() {
-	KERNEL_IMAGE_NAME="Image.lz4-dtb" downstreamkernel_package "$builddir" "$pkgdir" "$_carch" \
-		"$_flavor" "$_outdir"
-}
-
-sha512sums="
-cdba93be679f6b084432ec6069d809390fce60667ca1a9dc3eccf916959e687f4898e1e07c263582c900aa3e1cb5a517a4e28dd0bf4f9f1328fbf6b3e06d5048  linux-google-sargo-b72846a92eb2df2fe5c73dc1159292286f022258.tar.gz
-8d7f41c8b157f454024b115d693d7c7a0b864233390c78b1562784c8720b37973ca563689c2aca32ede7d8f85c3f38f9da6921a80d8185bc64bff7ffbd7da5d6  config-google-sargo.aarch64
-"