soc/intel_adsp: ipc: Remove fragile device state check

Checking if the device state is locked is not correct, device runtime
put / get is no longer checking for it and the only place that was
locking device's state was the pm action callback and if the idea
was to protect some concurrent call, using it is not enough.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>