Add UDP_ENCAP Constants to OsConstants.java

-Add UDP_ENCAP sockopt
-Add UDP_ENCAP_ESPINUDP_NON_IKE and UDP_ENCAP_ESPINUDP
 values for UDP_ENCAP sockopt

Bug: 30984788
Test: cts - IpSecManagerTest#testUdpEncapsulation()
Change-Id: I756270b1d21c84a64e4d934f7732d1a20281f198
2 files changed