Support customized DHCP client options.

Provide a new API in ProvisioningConfiguration class to allow OEMs
appending customized DHCP client options, these new options should
be only sent to the target network for the networking interoperability
compatibility via checking the vendor-specific IE OUI and Type in the
ScanResultInfo class passed from Wi-Fi, if the specific IE isn't found,
then preserve the default options.

Bug: 169128961
Test: atest NetworkStackIntegrationTest
Test: atest NetworkStackTests
Change-Id: I8c9cc0a0f91167cde32a960ee9f57b1b0549c089