Install broadcom-wl to the release ISO

Fixes FS#58239
Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>

configs/releng/airootfs/etc/modprobe.d/broadcom-wl.conf

+# The broadcom-wl package requires some modules to be disabled in order to use
+# wl. Since the ISO image needs to cover many hardware cases, this file
+# overrides the default blacklist in /usr/lib/modprobe.d/
+#
+# If you need to use wl, you may need to delete this file, then `rmmod` any
+# already-loaded modules that are now blacklisted before proceeding to modprobe
+# wl itself.

configs/releng/packages.both

 arch-install-scripts
 b43-fwcutter
+broadcom-wl
 btrfs-progs
 clonezilla
 crda