Implement seperate syscall for switching to an application #96

Job	Run time
build_attest_all (buildconfigs/key_xor_test_app.sh)	2m 10s
build_attest_all (buildconfigs/oak_client_android_app.sh)	44m 5s
build_attest_all (buildconfigs/oak_containers_kernel.sh)	25m 8s
build_attest_all (buildconfigs/oak_containers_orchestrator.sh)	5m 54s
build_attest_all (buildconfigs/oak_containers_stage1.sh)	3m 33s
build_attest_all (buildconfigs/oak_containers_syslogd.sh)	5m 12s
build_attest_all (buildconfigs/oak_containers_agent.sh)	3m 52s
build_attest_all (buildconfigs/oak_containers_system_image.sh)	11m 7s
build_attest_all (buildconfigs/oak_echo_enclave_app.sh)	2m 30s
build_attest_all (buildconfigs/oak_echo_raw_enclave_app.sh)	2m 10s
build_attest_all (buildconfigs/oak_functions_enclave_app.sh)	2m 29s
build_attest_all (buildconfigs/oak_functions_insecure_enclave_app.sh)	2m 23s
build_attest_all (buildconfigs/oak_orchestrator.sh)	2m 6s
build_attest_all (buildconfigs/oak_restricted_kernel_simple_io_init_rd_wrapper_bin.sh)	2m 53s
build_attest_all (buildconfigs/stage0_bin.sh)	2m 40s
	1h 58m 12s

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