Self-signed cert parameters are now optional.

This is a follow-up to 67d21aef98bbafd0def2cacc6254e644e911c8dd in
frameworks/base which made specifying self-signed cert parameters
optional when generating key pairs in AndroidKeyStore.

This CL adjusts the CTS to match.

Bug: 18088752
Bug: 20636391
Change-Id: I1bcdebe5305c9a9d1903a52fde6f59a40b08eb43
1 file changed