gadgetd: add symbolic link to ffs-daemon.h
gadgetd: add symbolic link to ffs-daemon.h

add symbolic link to ffs-daemon.h to prevent problems
during examples build

Change-Id: I31be01af4048b3c789c990e7d28badc956edd9ab
Signed-off-by: Stanislaw Wadas <45c1812d781e6eb1765fa6c6737751add3c95468@samsung.com>

gadgetd/gadgetd,gadgetd/gadgetd,gadgetd/gadgetd