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Fix some of WITNESS complaints and bootup lock by removing msg_avail

Description

Fix some of WITNESS complaints and bootup lock by removing msg_avail
condvar/mutex. They're basically no-op because error is not propagated
up the call chain. We still report message failures in VC service callback

Details

Provenance
gonzoAuthored on
Parents
rS290535: vchiq interrupt is MP safe, add respective flag to bus_setup_intr
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