[nrf fromlist] net: buf: revert disallowing blocking in syswq #2440
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DNM: PR to run CI to see if the reversal affects other parts of NCS
Reverts the change made in d4d53010f00cadbb4f89c6d41391937646fc1740 (The changes was moved to another file in a restructuring)
The commit incorrectly assumed that no blocking would be allowed in the syswq. This has caused issues observed among others in #77241 and #80167
(cherry picked from commit 05b5472bee2e7b2d5616d2c971b966753abccea8)