Add support for a fallback boot entry. Fallback boot entries can be used to ensure that a system starts even if the default boot entry fails or other unexpected events happen that can prevent to use the default boot entry (boot firmware failure, failed A/B OTA update etc). The EFI variable `LoaderEntryFallback` contains the fallback boot loader entry to use. config_is_fallback_required() expected to be extented to support possible conditions when we should fall back to "recovery" boot entry. Signed-off-by: Igor Opaniuk <igor.opaniuk@foundries.io>
System and Service Manager
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