Overcome disconnect during oem override

Cherry-pick from 83a0d6fa

While bootup, usb gets configured when the property triggers are
run. While in oemOverride, the current configuration is persisted
in sys.usb.<bootmode>.config. Do not reconfigure the stack if the
current configuration is same as the new configuration.

Bug: 64225494
Change-Id: Id35d110bf3fa8f58d05e14941716d4ad2b196f8d