device-htc-m8: add lk2nd dependency (MR 5919)

Like most msm8974 devices, lk2nd is used to boot mainline linux on the
HTC One (M8).

Add it as a dependency of the mainline kernel build, so that it is built
when required. It can be flashed with 'pmbootstrap flasher flash_lk2nd'
while in the vendor bootloader fastboot mode.

Only extlinux mode is supported for mainline kernel, as otherwise the
initramfs is too big for the boot partition.

Signed-off-by: Alexandre Messier <alex@me.ssier.org>

device/testing/device-htc-m8/APKBUILD

 # Reference: <https://postmarketos.org/devicepkg>
 pkgname=device-htc-m8
 pkgdesc="HTC One M8"
-pkgver=1
-pkgrel=2
+pkgver=2
+pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
 arch="armv7"
@@ -42,7 +42,7 @@ kernel_downstream() {
 
 kernel_mainline() {
 	pkgdesc="Close to mainline kernel"
-	depends="linux-postmarketos-qcom-msm8974"
+	depends="linux-postmarketos-qcom-msm8974 lk2nd-msm8974-htc-m8"
 	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
 }
 
@@ -53,7 +53,7 @@ nonfree_firmware() {
 }
 
 sha512sums="
-596b3e77947cffe9c20d8e679aca1e8620b41dd9f516a6625fbf4985eefcf875eec246d32ae2f9943aed0c0fc98c84c56ff047a9ea38f10e287219cf05128217  deviceinfo
+697e5942ee2f900e4827495cc4deb4e2eaf76329146c554410d1e9c234d10026bf1a1bb655048d099753dc270d0c4cba2207f592c49bf06a5153dee7fa65c8e4  deviceinfo
 765abaad5fda0dfda5e62e1e48414d3eea822198f39d0792171a04d73f86f6273a6e562afab430cbfcdd084412568a0ad03d012e9c40c5564f5cd1b9c0f181eb  initfs-hook.sh
 f0f69ab3b5b3fed11ec5049f37c71c4e9dcf87dc1f238199a3917dd61957d46783a8798d63d400cc5d3983987e750e3fec6d7117561ad5005f28131ae4821d66  90-android-touch-dev.rules
 "

device/testing/device-htc-m8/deviceinfo

@@ -21,6 +21,7 @@ deviceinfo_flash_fastboot_partition_rootfs="system"
 deviceinfo_kernel_cmdline_downstream="console=ttyHSL0,115200,n8 androidboot.hardware=qcom user_debug=31 ehci-hcd.park=3 zcache androidboot.selinux=permissive"
 deviceinfo_kernel_cmdline_mainline="console=tty0 PMOS_NOSPLASH"
 deviceinfo_generate_bootimg="true"
+deviceinfo_generate_extlinux_config_mainline="true"
 deviceinfo_bootimg_qcdt_downstream="true"
 deviceinfo_flash_offset_base="0x00000000"
 deviceinfo_flash_offset_kernel="0x00008000"
@@ -29,3 +30,6 @@ deviceinfo_flash_offset_second="0x00f00000"
 deviceinfo_flash_offset_tags="0x01e00000"
 deviceinfo_flash_pagesize="2048"
 deviceinfo_flash_sparse="true"
+
+# lk2nd does not support GPT for subpartitions/SD cards yet
+deviceinfo_partition_type_mainline="msdos"