feat/efc: add API for read/erase/write flash #83

Job	Run time
setup	4s
build-features (reconfigurable-system-pins)	2m 9s
build-features (usart-spi-host-without-select)	2m 7s
build (same70j19b)	2m 5s
build (same70j20b)	2m 7s
build (same70j21b)	2m 51s
build (same70n19b)	2m 30s
build (same70n20b)	2m 3s
build (same70n21b)	2m 45s
build (same70q19b)	2m 28s
build (same70q20b)	2m 26s
build (same70q21b)	2m 14s
build (sams70j19b)	2m 4s
build (sams70j20b)	2m 16s
build (sams70j21b)	2m 1s
build (sams70n19b)	2m 31s
build (sams70n20b)	2m 23s
build (sams70n21b)	2m 28s
build (sams70q19b)	2m 25s
build (sams70q20b)	2m 5s
build (sams70q21b)	2m 33s
build (samv70j19b)	2m 3s
build (samv70j20b)	2m 22s
build (samv70n19b)	2m 7s
build (samv70n20b)	2m 34s
build (samv70q19b)	2m 5s
build (samv70q20b)	2m 31s
build (samv71j19b)	2m 6s
build (samv71j20b)	2m 8s
build (samv71j21b)	2m 15s
build (samv71n19b)	2m 10s
build (samv71n20b)	2m 32s
build (samv71n21b)	2m 3s
build (samv71q19b)	2m 32s
build (samv71q20b)	2m 37s
build (samv71q21b)	3m 26s
board-examples (atsame70_xpro)	3m 2s
board-examples (atsamv71_xult)	3m 6s
clippy-hal	2m 47s
docs	2m 23s
clippy-examples (atsame70_xpro)	2m 26s
clippy-examples (atsamv71_xult)	2m 24s
	1h 38m 14s

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