Match ciphers by exact mode name

Ensure that ciphers are picked by exact mode name match instead of by
prefix. Also the mode names are case insensitive [1], hence use
equalsIgnoreCase

[1]
https://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html

Bug: 148376475
Test: atest CtsLibcoreTestCases
Change-Id: I23d25d072f7b1f53f2697a3c8a1fb8444ff87cab
1 file changed