main/postmarketos-cros-common: add makedepends (MR 5876)

Fill out makedepends, so pmbootstrap and bpo know that these packages
need to be built before building postmarketos-cros-common, because it
has subpackages depending on these packages. Without this,
bootstrapping v24.12 currently fails:
https://builds.sr.ht/~postmarketos/job/1381582

This is intended behavior, abuild works the same way:
https://gitlab.alpinelinux.org/alpine/abuild/-/issues/10138

[ci:skip-build]: already built successfully in CI

main/postmarketos-cros-common/APKBUILD

@@ -2,7 +2,7 @@
 pkgname=postmarketos-cros-common
 pkgdesc="Common package for Chrome OS devices"
 pkgver=2
-pkgrel=3
+pkgrel=4
 url="https://postmarketos.org"
 license="BSD-3-Clause"
 arch="aarch64 armv7 x86_64 x86" # there are no cros devices of other arches
@@ -12,6 +12,11 @@ subpackages="
 	$pkgname-sway
 	postmarketos-cros-keymap-openrc:_keymap_openrc
 "
+makedepends="
+	cros-keyboard-map-openrc
+	keyd-openrc
+	postmarketos-ui-sway-logo-key-alt
+"
 source="
 	00_postmarketos-cros-common-gnome.gschema.override
 "