device-samsung-expressatt: Add linux-lts, linux-edge, & linux-stable

Add more mainline-linux kernels that are more stable that linux-next

Also, let’s not install the firmware Library of Alexandria

Part-of: https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/6507
[ci:skip-build]: already built successfully in CI

device/testing/device-samsung-expressatt/APKBUILD

@@ -2,13 +2,19 @@
 pkgname=device-samsung-expressatt
 pkgdesc="Samsung Galaxy Express SGH-I437"
 pkgver=2
-pkgrel=0
+pkgrel=1
 url="https://postmarketos.org"
 license="MIT"
 arch="armv7"
 options="!check !archcheck"
-depends="postmarketos-base linux-next mkbootimg"
+depends="postmarketos-base mkbootimg linux-firmware-none"
 makedepends="devicepkg-dev"
+subpackages="
+	$pkgname-kernel-next:kernel_next
+	$pkgname-kernel-edge:kernel_edge
+	$pkgname-kernel-stable:kernel_stable
+	$pkgname-kernel-lts:kernel_lts
+"
 source="deviceinfo"
 
 build() {
@@ -19,6 +25,29 @@ package() {
 	devicepkg_package $startdir $pkgname
 }
 
+kernel_next() {
+	pkgdesc="Unstable next kernel (linux-next)"
+	depends="linux-next"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+}
+
+kernel_edge() {
+	pkgdesc="Mainline kernel from Alpine Linux (linux-edge)"
+	depends="linux-edge"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+}
+
+kernel_stable() {
+	pkgdesc="Mainline kernel from Alpine Linux with LTS config (linux-stable)"
+	depends="linux-stable"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+}
+
+kernel_lts() {
+	pkgdesc="Long term support (LTS) kernel from Alpine Linux (linux-lts)"
+	depends="linux-lts"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+}
 
 sha512sums="
 29e784303698fe1dc56a9d952cb2081527efb4422d5e729e622a2db51274e65c7a612ba331acfbfa04529f77bbc62896f018d2cdd98bd8cc64900d306c4a07d7  deviceinfo