[Dexopt] Add an exception for Webview to Dexopt both APIs.

Webview uses arm as the primary ABI, while other arm64 apps can use it,
which means we need to compile both ABIs for webview, even if it is not
used yet.

Bug: 306362133
Bug: 430194763
Flag: com.android.art.flags.dexopt_secondary_isa_only_when_needed
Test: `m`
Test: `atest ArtServiceTests`
Test: https://android-build.corp.google.com/test_investigate/invocation/I81400010423069562/test/TR84529814951267124
Change-Id: Ibcf63e9c379edf0e2993f3fed9233cccb0446ae9