Fix AV FOTA package download crash after long time network loss
Fix AV FOTA package download crash after long time network loss

The current retry mechanism to resume a FOTA download will cause
watchdog timer reset after long time network loss. The fix here is
to add a new state LE_AVC_DOWNLOAD_TIMEOUT. If retry fails, package
downloader will report this status to avcServer to let avcServer to
handle it.

Resolves: LE-15755
Related: EURY-3896 LE-15729
Change-Id: Id87d91b517f09350d1884842e124c348faca942d

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af