GCMParameters: in ASN1 encoding, use 12 when no value is specified

This reverts commit 4d0e19131da68053fe1a73d43052bedadb107c70

Bug: 26231099
Bug: 26234568
Bug: 29876633
Change-Id: I44c0c68f1e92caf6547c9e3b494ec5b82b8cff5f
1 file changed