sm8450-common: qcril_database: Add missing migration for db 15.0
The shipped qcrilNr.db on diting miui V816.0.7.0.ULFMIXM has version 15.0
and sets persist.vendor.radio.unicode_op_names to true. However xiaomi
missed to include the migration to vendor, leading to OTA updates missing
the new change. Add the migration based on observing the stock db changes.
Change-Id: Iced27d8d8ea02594dd4c26a5ed6b8c51b4b61f20