PDL: use Address in MsftLeMonitorDeviceEventPayload

Let the BD address of MsftLeMonitorDeviceEventPayload use the existing
Address type in PDL for better compatibility.

Bug: 261482382
Tag: #floss
Test: ./build.py --target test
Test: atest packages/modules/Bluetooth/system/gd/hci/hci_packets_test.cc
Test: Manual test on a ChromeOS device

Change-Id: I15eb308ea0b816029c1d24ab1695a1c030f6f8f3