dt: dt-extract-compatibles: Handle cfile arguments in generator function

[ Upstream commit eb2139fc ]

Move the handling of the cfile arguments to a separate generator
function to avoid redundancy.

Signed-off-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Link: https://lore.kernel.org/r/20230828211424.2964562-2-nfraprado@collabora.com


Signed-off-by: Rob Herring <robh@kernel.org>
Stable-dep-of: 8f51593c ("dt: dt-extract-compatibles: Don't follow symlinks when walking tree")
Signed-off-by: Sasha Levin <sashal@kernel.org>