test

Add initializers for peripherals based on numbers #6

Job	Run time
rustfmt	29s
most-tests (native)	1h 1m 8s
quick-examples (examples/rust-hello-world, native)	2m 59s
most-tests (sltb001a)	2h 3m 8s
quick-examples (examples/rust-hello-world, sltb001a)	3m 30s
most-tests (samr21-xpro)	1h 3m 35s
quick-examples (examples/rust-hello-world, samr21-xpro)	3m 15s
most-tests (stk3700)	2h 7m 19s
quick-examples (examples/rust-hello-world, stk3700)	3m 33s
quick-examples (examples/rust-gcoap, native)	3m 12s
quick-examples (examples/rust-gcoap, sltb001a)	3m 50s
quick-examples (examples/rust-gcoap, samr21-xpro)	3m 40s
quick-examples (examples/rust-gcoap, stk3700)	3m 48s
quick-examples (tests/rust_minimal, native)	3m 4s
quick-examples (tests/rust_minimal, sltb001a)	3m 32s
quick-examples (tests/rust_minimal, samr21-xpro)	3m 14s
quick-examples (tests/rust_minimal, stk3700)	3m 29s
	6h 56m 45s

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