firmware-samsung-klte: Samsung Galaxy S5 firmware

Firmware for Broadcom Device Host Dongle (bcmdhd, bcm4354) chip.

Install location (/lib/firmware/postmarketos) matches kernel options to load firmware from, see config-samsung-klte.armv7 line 1903, 1904

With this, Wi-Fi almost works, (wlan0 and p2p0 devices appear) but several more actions are needed to bring it online:

1. since driver is built in, we need to "re-init" it using deferred initcalls mechanism (cat /proc/deferred_initcalls). This is normally done by Android init, see init.sec.boot.sh#L4, but can also be done manually or by openRC init script.
2. change wpa_supplicant config to explicitly use wlan0 (-iwlan0) as device (it autodetects p2p0 otherwise).

These configs will be part of device package, I think.

This MR is the follow-up to !321 (merged) , 2nd part.

✔ 1. deal with kernel (choose correct branch and add my patches from halium)
✔ 2. deal with firmware (for now - wi-fi)
  3. deal with device package (lots of device-specific configuration here)
  4. upstream fix to alpine lxc to work on 3.4 kernel (without memfd support)
  5. fix lxc-android config and scripts

device/device-samsung-klte/APKBUILD

@@ -2,7 +2,7 @@
 pkgname="device-samsung-klte"
 pkgdesc="Samsung Galaxy S5"
 pkgver=0.2
-pkgrel=5
+pkgrel=6
 url="https://postmarketos.org"
 license="MIT"
 arch="armv7"
@@ -12,6 +12,7 @@ makedepends="devicepkg-dev"
 subpackages="
 	$pkgname-kernel-downstream:kernel_downstream
 	$pkgname-kernel-mainline:kernel_mainline
+	$pkgname-nonfree-firmware:nonfree_firmware
 "
 source="deviceinfo"
 
@@ -35,4 +36,10 @@ kernel_mainline() {
 	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
 }
 
+nonfree_firmware() {
+	pkgdesc="Wifi firmware"
+	depends="firmware-samsung-klte"
+	mkdir "$subpkgdir"
+}
+
 sha512sums="186911ec5eb189826aa515e467d95270adbb1ae0eef36133a1ec3928ddab38a1cbd1bbbeaf2965bc02f5b1d1b603e360229c54fd9118b40558ab9e8066a72448  deviceinfo"