Telephony: Add support for Sprint TW "System select" choices.

Also fixes the no-roaming bug due to the lack of the CDMA_RM_DOMESTIC
option, which forces CDMA_RM_HOME when opening the "Mobile networks"
settings screen.

From CM 10.2: I32129efe217e5f79372aab49e45c668393c3dc2a.

Change-Id: If3de040144e96253ba869cfbcfe8902597ce92b8
Mms: Fix multipart SMS on Sprint.

Use MmsConfig defaults for enableMultipartSMS (true) and maxMessageTextSize
(2000).

Change-Id: Id49c22297f4a651ebbeb83a15dcc52a7e769419d
Merge "Telephony: Add support for Sprint TW "System select" choices." into cm-11.0