Address API review comments for DhcpOption object

Add a link to javadoc for the allowed types and use the lint annotation
to suppress compilation errors instead of modifying the baseline file.

Bug: 213240318

Test: atest FrameworksNetTests
Test: atest NetworkStackTests

Signed-off-by: Mingguang Xu <mingguangxu@google.com>
Change-Id: I2a83cc19baa25068326517b30a9afdea19536af9
2 files changed