Fix Half Pel MC on Last Ref Row If MC is referring to the last MB row, in case of field pictures, it could incorrectly read up to 8 extra rows in the reference buffer and 9 rows in case of half_y prediction. Bug: 63873837 Test: ran POC on patched ASAN-enabled code Change-Id: I83af03b3c6b7e08a984f7b383bedf706422f6354 (cherry picked from commit 8c0289c09cddd378cd9a321ccdb1c62e7b80f626)