remove unneeded dontwarn settings

Some of these -dontwarn settings were added because r8 did not have access to transitive dependencies. Now these dependencies are passed as -libraryjars we can remove some of the -dontwarns.

Test: TARGET_BUILD_VARIANT=userdebug MODULE_BUILD_FROM_SOURCE=true \
  UNBUNDLED_BUILD_SDKS_FROM_SOURCE=true \
  packages/modules/common/build/mainline_modules_arm64.sh -j120
Bug: 242088131
Change-Id: I408a8f3ac9d11c1bd6608f2a18fd2291db8c9275