kconfig: save location of config symbols
When we add a new config symbol save the file/line so we later can refer to their location. The information is saved as a property to a config symbol because we may have multiple definitions of the same symbol. This has the side-effect that a symbol always has at least one property. Signed-off-by: NSam Ravnborg <sam@ravnborg.org> Cc: Roman Zippel <zippel@linux-m68k.org> Signed-off-by: NMichal Marek <mmarek@suse.cz>
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