gralloc: add libgralloctypes.so to VNDK-SP

Add libgralloctypes to the VNDK-SP. This library contains functions
that encode and decode buffer metadata. The library will be used by
by vendors and the framework.

Bug: 141632767
Test: Compiles. Gralloc is tested through VTS.
Change-Id: I2da3ae7539353654958eba802e8a6a4ef849d740