Fix the return type of ADisplayLutsEntry_getDimension and ADisplayLutsEntry_getSamplingKey.

- to fix https://screenshot.googleplex.com/4BTVD4TjjDfuwcs

Bug: n/a
Change-Id: I9fdc07acef94be75f251a0246cea5116ac01f892
Test: builds
Flag: EXEMPT NDK
1 file changed