RIL: Fix manual network selection with old modem

 * Old modem sends and applies mccmnc+network type, but new aosp
   telephony uses only digits.
 * Manually cut or append the "+" and strings after that to work around.

[FP] removed conditionally check based on prop

Issue: FP3-A13#233
(cherry picked from https://github.com/LineageOS/android_frameworks_opt_telephony/commit/a6bc00af33896a099043c5d79fd7e91fc0859aca)

Change-Id: I43bbcc9926bb9070c7fe956f4da7321169899ee2
2 files changed