Variable length flag was lost during attribute settings,
so variable length GATT attributes should have been set
to the predefined maximum length.
This fixes issue #86.
Change-Id: Ia0cd236ecd903fdb9e62a21bffef57d1e63764b9
In the process, the path has been shortened and the unecessary ble
directory between FEATURE_BLE and the actual implementation has been
removed.
commit id of ARMmbed : 17728a824c7273e16b6b74fae871e2997c88ecd1