Add alpha Strings to CellIdentityTdscdma

Add equivalent alphaLong and alphaShort to
TD-SCDMA so that it's equivalent to LTE, WCDMA,
GSM, etc.

Bug: 75980473
Test: compilation
Merged-In: Ibaa8a7daafb44f7fc94f0fd6aaa193b67793eea4
Change-Id: Ibaa8a7daafb44f7fc94f0fd6aaa193b67793eea4
(cherry picked from commit 0acd7eee)