Add new default_reserved_data_coding_scheme config

New default_reserved_data_coding_scheme config is added to support
carrier specific encoding type for reserved TP-DCS value.

For KT(mcc=450, mnc=08), TP-DCS 0x0C means ENCODING_KSC5601.

Test: Manual

Change-Id: I4412a2557b2d668660797383d7a72d09c9311b5a
Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>