.gitignore: add SPDX License Identifier
Masahiro Yamada authored

Add SPDX License Identifier to all .gitignore files.
Signed-off-by: default avatarMasahiro Yamada <masahiroy@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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