(DO NOT MERGE) Enable InScript keyboards for L

This CL enables the followin InScript keyboards for L-release.
- Sinhala
- Tamil
- Bengali
- Telugu
- Marathi
- Kannada
- Malayalam

Bug: 6911143
Bug: 9978106
Bug: 10028755
Bug: 10028759
Bug: 10028772
Bug: 10029252
Bug: 10417006
Change-Id: Id8962b429fbb58b5c2c90a65849af6a6fe84a8c9