Rename setDataEnabledWithReason

1. Rename setDataEnabledWithReason to
setDataEnabledForReasn

2. Allow isDataConnectionAllowed to be accessed by
same apps as isDataEnabledForReason

3. Make these apis public

Bug: 156332911
Test: cts and build
Change-Id: I8672ab8861fdec1854427ee9ce5ad8eec8774608
Merged-In: I8672ab8861fdec1854427ee9ce5ad8eec8774608
6 files changed