Resolve paths of dir.${section} if possible

Some devices place some of their partitions under /system. If the linker
resolves that paths, verboseness of ld.config.txt will be reduced as we
don't need to add both /system/{partition} and /{partition}.

Bug: http://b/80422611
Test: m -j, boot on taimen, atest
Change-Id: I6b712170bb89229b764026e2cc517c426e6e6063