main/linux-firmware: upgrade to 20180615 and add provides
add provides=linux-firmware-any. This makes it possible for users to pick a set of needed firwmare packages instead of pulling them all in. We also set provider_priority so that if no firwmare package is explicitly added, users will get them all for backwards compatibility. We also provide an empty linux-firmware-none in case some user does not need any firmware at all.
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