Use GATT server's get mtu size API instead of GATT client API
GATT server's get mtu size API is added on Tizen 5.5 public.
So we also add Tizen BLE 5.5 build option for the compatibility.
https://github.sec.samsung.net/RS7-IOTIVITY/IoTivity/pull/524/commits/
6b31a4840ddceaeb699293dff833353d39901675
(cherry-picked from
6b31a4840ddceaeb699293dff833353d39901675)
Change-Id: I96137ae7382d189460edc7427f4f2d6add212817
Signed-off-by: DoHyun Pyun <dh79.pyun@samsung.com>
Signed-off-by: Sudipto Bal <sudipto.bal@samsung.com>