wifi: Add new configuration backup/restore

New configuration includes
a. bands and channels
b. mac ramdomization setting
c. bridged mode opportunistic shutdown control

backup/restore on device side (xml) and cloud side (byte[])

Test: atest -c FrameworksWifiTests
Bug: 162686273
Bug: 151189102
Change-Id: I5dd6b60868935dd7dc2182ebf535df9931a7094d
6 files changed