meta-gbmc-staging: entity-manager: Increase FRU scan delay This CL increase the wait time to 3 seconds on receiving the power signal and performing the FRU scan. Tested: https://paste.googleplex.com/5869372272934912 Fusion-Link: (no fusion2 Real-HW) Google-Bug-Id: 469765424 Change-Id: I79e3741d3a0f43c339618a4c25765005a7837ea4 Signed-off-by: Muhammad Usama Chaudhry <muhammadusama@google.com>