Revert "media: qcom: camss: Restructure camss_link_entities"

This reverts commit cc1ecabe.

This commit has a basic flaw in that it relies on camss->res->csid_num as a
control to index the array camss->vfe[i].

Testing on a platform where csid_num > vfe_num showed this bug up.

camss->vfe should only be indexed by camss->res->vfe_num. Since this commit
is meant to make the code be more readable reverting will simply restore
the previous correct bounds checking.

We can make another pass at making camss_link_entities look prettier but,
for now we should zap the bug introduced.

Fixes: cc1ecabe ("media: qcom: camss: Restructure camss_link_entities")
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>