device-google-manta: Add two generic kernels

Add mainline and stable options from the pmOS generic kernels to the
google-manta board.

Signed-off-by: Lukas Timmermann <lukas@timmermann.space>
Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/9435>

device/community/device-google-manta/APKBUILD

@@ -3,7 +3,7 @@
 maintainer="Alexandre Marquet <tb@a-marquet.fr>"
 pkgname=device-google-manta
 pkgdesc="Google Nexus 10"
-pkgver=19
+pkgver=20
 pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
@@ -14,7 +14,6 @@ depends="
 	firmware-google-manta
 	linux-firmware-brcm
 	linux-firmware-s5p-mfc
-	linux-postmarketos-exynos5>=6.18.33
 	postmarketos-base
 	systemd-boot
 	u-boot-manta
@@ -22,7 +21,10 @@ depends="
 makedepends="devicepkg-dev"
 subpackages="
 	$pkgname-openrc
-	"
+	$pkgname-kernel-stable:kernel_stable
+	$pkgname-kernel-mainline:kernel_mainline
+	$pkgname-kernel-exynos5:kernel_exynos5
+"
 source="
 	deviceinfo
 	modules-initfs
@@ -59,6 +61,24 @@ package() {
 
 }
 
+kernel_stable() {
+	pkgdesc="Stable kernel (recommended, best balance between stability and features)"
+	depends="linux-postmarketos-stable"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+}
+
+kernel_mainline() {
+	pkgdesc="Upstream development kernel (regular breakage, latest features)"
+	depends="linux-postmarketos-mainline"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+}
+
+kernel_exynos5() {
+	pkgdesc="Exynos5 kernel fork (best device support, mostly feature complete)"
+	depends="linux-postmarketos-exynos5>=6.18.33"
+	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
+}
+
 openrc() {
 	default_openrc
 	# replaces openrc for hwclock configuration