Update OsTest#test_socket_setSockoptTimeval_effective

After setting the receive timeout, read-back the value that the kernel
has and use that for determining if the timeout is too early.

Bug: 216667550
Test: atest CtsLibcoreTestCases:libcore.android.system.OsTest#test_socket_setSockoptTimeval_effective
Change-Id: I91f729f8637bf8cea819a28bca89332c12c46bcb
1 file changed