main/bootmac: support systemd

This new version includes initial support for systemd (for bluetooth only atm). udev rules are only installed for openrc systems, bt config on systemd was replaced by a unit file and using bootmac for wifi has issues (bootmac#7)

old description

This adds a -systemd subpkg to install a unit file (for bluetooth right now). This also includes some patches that were sent upstream to bootmac project, which can be dropped if/when it's accepted in the bootmac project and a new release is made.

The patches here have been sent upstream: bootmac!10 (merged)

openrc installs will still use the udev rule to run bootmac for bluetooth, since that seems to work reliably (and there's no concept of service targets or anything that would make this easy to implement on openrc, but I digress).

Both systemd and openrc installs will continue to use udev rules for wifi mac setting, I don't have a way to test that this works, sd unit file can be created later if it improves the situation there.

cc @DylanVanAssche

extra-repos/systemd/postmarketos-base-systemd/APKBUILD

 # Maintainer: Oliver Smith <ollipearanoid@postmarketos.org>
 # pmbootstrap installs this, if systemd is selected in "pmbootstrap init".
 pkgname=postmarketos-base-systemd
-pkgver=18
+pkgver=19
 pkgrel=0
 pkgdesc="Meta package for running postmarketOS with systemd"
 url="https://postmarketos.org"
@@ -72,7 +72,7 @@ sha512sums="
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 2faac294bb632762e247b850f09ff4b544ccff6c462efd8d4faca71ba30bdfa9c460377a0dc88e92c5dbbe251017d164064a56ac0e0410f224b45d4f5f81866c  rootfs-etc-systemd-logind.conf
 15423bfda57c90ab62fe69865ca4072a0aeb83bf77d9c278257e346f4da81843d010b41003c91ae9f3fcb1c67447645e7c19078eea2bf11312051e6ad7523ad1  rootfs-usr-share-mkinitfs-files-01-initramfs-base-systemd.files
-3a436e715346f1849ded4b1368ce6a8e9d075777d45382ef63709e32711673151e8ebd2f9b2d04013f0fc6691dcec5fa2a252ff1bd551d6840a6e6c7b5f34d47  rootfs-usr-lib-systemd-system-preset-90-base.preset
+4beb3b023495f110f6260955caf5bc644848c56e5f03f4b4f6a18cb47e5d3de6591295c023f4c3a03475dca88e6db869a5eaf4ea116d33e51c512e270f5ccb6e  rootfs-usr-lib-systemd-system-preset-90-base.preset
 aaa5af21270364495573c1e2503f8521fa1ea39ba12742d4edc459284b19dc70f7840daf0225a2e965a4f21ce2c310693e80c2e69d7b8e1b8fe477fa7c26942d  rootfs-usr-lib-systemd-user-preset-90-base.preset
 605df1f004783d2e0ec5dd99a688bca27502c8c24bc05fb4dc26589b2070b0fbd1cf9bd56e6861d7cda2f8ac8147e7eb040acfd886185c01c8cf9de8b1ce2dcd  rootfs-usr-bin-setup-timezone
 "