Don't send more than 2K to addRngEntropy

Bug: 63745893
Test: VtsHalKeymasterV3_0TargetTest
Merged-In: I136920d3b62e026b22fbe06594bc40ccddc57dc3
Change-Id: I136920d3b62e026b22fbe06594bc40ccddc57dc3
(cherry picked from commit 3e1267edf0621185043482a805fcec0fa2a63719)
(cherry picked from commit 02ffb2be413d4cbaaefa1313903e1f108eda4c9e)
1 file changed