Disable native coverage for libinput_tests and inputflinger_tests.

These tests fail to build for coverage when Rust host coverage is
enabled. This is a temporary workaround until the underlying issue is
resolved.

Submit in git_main to backport to aosp-main with aosp/3070043

Flag: TEST_ONLY
Bug: 338242594
Bug: 330591720
Change-Id: Idf82d31ce8a7078c3502b7bcb7c959177a1bbe4e