Fix the names for network preference. (SL4A side)

[DO NOT MERGE]

1. change the string constants name to all capital cases.
2. remove unused Facade APIs (set network preference by integer)

BUG: 26354635
Change-Id: Ibdef87a95931d98dbf724c2ed8fdb38dbe895f0d
3 files changed
tree: 6b26f9aa9dd7343541a206fd8751a134a8e15c37
  1. sl4a/
  2. sl4n/