device-qemu-riscv64: add LTS kernel variant

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7854>

device/main/device-qemu-riscv64/APKBUILD

@@ -3,7 +3,7 @@
 maintainer="Luca Weiss <luca@lucaweiss.eu>"
 pkgname=device-qemu-riscv64
 pkgver=11
-pkgrel=2
+pkgrel=3
 pkgdesc="Simulated device in QEMU (riscv64)"
 url="https://postmarketos.org"
 arch="riscv64"
@@ -16,6 +16,7 @@ depends="
 makedepends="devicepkg-dev"
 subpackages="
 	$pkgname-kernel-stable:kernel_stable
+	$pkgname-kernel-lts:kernel_lts
 	$pkgname-kernel-mainline:kernel_mainline
 	"
 
@@ -39,6 +40,12 @@ kernel_stable() {
 	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
 }
 
+kernel_lts() {
+	pkgdesc="postmarketOS LTS kernel"
+	depends="linux-postmarketos-lts linux-firmware-none"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+}
+
 kernel_mainline() {
 	pkgdesc="postmarketOS Mainline kernel"
 	depends="linux-postmarketos-mainline linux-firmware-none"