storageproxyd: Add STORAGE_FILE_GET_MAX_SIZE API on Android side

This is the Android-side companion change to go/oag/2241573,
adding the interface for STORAGE_FILE_GET_MAX_SIZE (implementation
sold separately).

Bug: 247003431
Test: None
Change-Id: Ie834c91a085b2e4a668e0d9d22ec0f6b1e4e6c1c
1 file changed