Make Policy a generic trait #623

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	17m 27s
build_attest_all (buildconfigs/oak_client_android_app.sh)	49m 40s
build_attest_all (buildconfigs/oak_containers_agent.sh)	9m 43s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	30m 47s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	26m 3s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	23m 16s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	24m 40s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	26m 40s
build_attest_all (buildconfigs/oak_containers_nvidia_system_image.sh)	27m 51s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	17m 18s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	16m 53s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	17m 31s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	18m 12s
build_attest_all (buildconfigs/oak_orchestrator.sh)	17m 14s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	42m 44s
build_attest_all (buildconfigs/stage0_bin.sh)	41m 9s
build_attest_all (buildconfigs/stage0_bin_tdx.sh)	41m 22s
	7h 28m 30s

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