UBI: Fastmap: Add new module parameter fm_debug
If fm_debug is set fastmap debugging is enabled by default.
This is useful if one wants to debug fastmap on an UBI device
with serves the rootfs.
The the UBI attach mechanism runs long before debugfs can be mounted
and chk_fastmap set.
Signed-off-by: NRichard Weinberger <richard@nod.at>
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