Add a section flag to bypass failure if a specific path can't be found.

This is a temporary solution to bypass failure of reading cpu info or 
battery type in P if the path doesn't exist on some devices. See bug for
details. However in Q, incidentd should implement reading from the
common Linux kernel interfaces.

Bug: 78028767
Bug: 78239764
Test: atest incidentd_test
Change-Id: I08ffcb21709efe5478d2ac46121deb5795af1024
Merged-In: I08ffcb21709efe5478d2ac46121deb5795af1024