Take non-CMIS xcvrs out of lpmode in SFF Manager

Fix non-CMIS transceivers in down state by bringing them out of
lpmode in the SFF Manager Task.

Author: peterbailey-arista

sonic-xcvrd/xcvrd/sff_mgr.py

@@ -14,6 +14,7 @@
 
     from .xcvrd_utilities.port_event_helper import PortChangeObserver
     from .xcvrd_utilities.xcvr_table_helper import XcvrTableHelper
+    from sonic_platform_base.sonic_xcvr.api.public.sff8472 import Sff8472Api
 except ImportError as e:
     raise ImportError(str(e) + " - required module not found")
 
@@ -435,6 +436,17 @@ def task_worker(self):
                     # Skip if these essential routines are not available
                     continue
 
+                set_lp_success = (
+                    sfp.set_lpmode(False) 
+                    if isinstance(api, Sff8472Api) 
+                    else api.set_lpmode(False)
+                )
+                if not set_lp_success:
+                    self.log_error(
+                        "{}: Failed to take module out of low power mode.".format(
+                            lport)
+                    )
+
                 if active_lanes is None:
                     active_lanes = self.get_active_lanes_for_lport(lport, subport_idx,
                                                                len(lanes_list),