[nrf fromtree] Bluetooth: BAP: Update log for unicast iso recv without endpoint #1476
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Since we always set up the ISO data path for endpoints in both directions (due to limitations in the ISO API), we can actually receive valid (empty) SDUs on a CIS in a direction that has not been configured.
This is not the ideal solution, but prevents unncessary LOG_ERR. The ideal solution is to modify the ISO API to provide the flexibility that BAP needs w.r.t. ISO data paths, but that is a larger change for later.
(cherry picked from commit 13a357b)