Add fan_dev_shm_enable signal to Odin

Author: jacob720

src/ophyd_async/epics/odin/_odin_io.py

@@ -79,6 +79,7 @@ def __init__(self, prefix: str, name: str = "", nodes: int = 4) -> None:
         self.meta_stop = epics_signal_rw(bool, f"{prefix}META:Stop")
 
         self.fan_ready = epics_signal_rw(float, f"{prefix}FAN:StateReady_RBV")
+        self.fan_dev_shm_enable = epics_signal_rw(float, f"{prefix}FAN:DevShmCache")
 
         self.data_type = epics_signal_rw_rbv(str, f"{prefix}DataType")