bluetooth: avdtp: unify the avdtp error code based on Zephyr err code

get the avdtp error code based on Zephyr err code to make the codes more
clear.

Signed-off-by: Mark Wang <yichang.wang@nxp.com>
(cherry picked from commit 1d4d97fdb41791501eb63934f096bcc88cb2da81)
1 file changed