Providing build option to disable BLE server

Providing build option to disable BLE server

Build option DISABLE_BLE_SERVER is added so that BLE server
can be disabled when running in CLIENT_SERVER mode.

Just provide DISABLE_BLE_SERVER = 1 option to disable it.

https://github.sec.samsung.net/RS7-IOTIVITY/IoTivity/pull/394
(cherry picked from ea611133c372df685cb58842dd6d7c06276d0aeb)

Change-Id: I7552f378406e92b6c847cd73debfd31336d074a5
Signed-off-by: agrkush <kush.agrawal@samsung.com>
Signed-off-by: Kush Agrawal <kush.agrawal@samsung.com>
Signed-off-by: Abhishek Sansanwal <abhishek.s94@samsung.com>