Fix: Handle the duplicated gatt descriptor

Fix: Handle the duplicated gatt descriptor

[Model] All
[BinType] AP
[Customer] OPEN

[Issue#] N/A
[Request] Internal
[Occurrence Version] N/A

[Problem] Duplicated gatt event occured for a same uuid.
[Cause & Measure] descriptor duplicated on list. Check the path before adding it.
[Checking Method] Service browsing

[Team] Convergence BT
[Developer] Injun Yang
[Solution company] Samsung
[Change Type] Specification change

Change-Id: I897a7a6d4cebd06162159222ed3606b3fa4f5c64
Signed-off-by: injun.yang <injun.yang@samsung.com>
Signed-off-by: Wootak Jung <wootak.jung@samsung.com>