Add support for showing remapped blocks and garbage collecting old
remapped blocks triggered by using the mark_good/mark_bad files
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Preparation for supporting BMT on MT7621. Move source files to the files/
subdirectory in order to simplify maintenance
Signed-off-by: Felix Fietkau <nbd@nbd.name>