ffs inet: fix: Use real instance name while mounting
ffs inet: fix: Use real instance name while mounting

Instance name provided by user may be different that
unique instance name written to ConfigFS.

While mounting we sould use a system-wide unique
instance name, similar to that one  on ConfigFS.

Change-Id: I98c230a4ca7951df58122287b5caa65e11dddb2b
Signed-off-by: Krzysztof Opasiak <8064eda6f94b3817252b7d7649cf754592f63500@samsung.com>

gadgetd/gadgetd,gadgetd/gadgetd,gadgetd/gadgetd