msm: npu: Support multiple misc commands concurrently

When running multiple NPU applications concurrently, sending
misc command to firmware may fail if there is an existing misc
command is processed by fw. This change is to remove this
limitation and allow multiple misc commands to be sent to fw
concurrently.

Change-Id: Ic6058ebf705d834f1649f9a4fb66029c445ab918
Signed-off-by: Jilai Wang <jilaiw@codeaurora.org>