storage: flash: always check if area is erased #1656

Job	Run time
release	10s
generate-matrix	24s
build-libopenblt-linux	59s
build-firmware (stm32f767_nucleo, config/boards/nucleo_f767/meta-info.env)	6m 8s
build-firmware (f407-discovery, config/boards/f407-discovery/meta-info.env)	5m 47s
build-firmware (proteus_f7, config/boards/proteus/meta-info-proteus_f7.env)	5m 21s
build-firmware (hellen-gm-e67, config/boards/hellen/hellen-gm-e67/meta-info.env)	5m 0s
build-firmware (small-can-board_debug, config/boards/hellen/small-can-board/meta-info-small-can-b...	5m 18s
build-firmware (hellen154hyundai_f7, config/boards/hellen/hellen154hyundai_f7/meta-info-hellen154...	4m 51s
build-firmware (proteus_f4, config/boards/proteus/meta-info-proteus_f4.env)	4m 59s
build-firmware (super-uaefi, config/boards/hellen/super-uaefi/meta-info.env)	4m 55s
build-firmware (alphax-8chan_f7, config/boards/hellen/alphax-8chan/meta-info-alphax-8chan_f7.env)	5m 32s
build-firmware (hellen-honda-k, config/boards/hellen/hellen-honda-k/meta-info-hellen-honda-k.env)	4m 40s
build-firmware (uaefi_pro, config/boards/hellen/uaefi/meta-info-uaefi_pro.env)	4m 54s
build-firmware (uaefi121, config/boards/hellen/uaefi121/meta-info.env)	5m 46s
build-firmware (mre-legacy_f4, config/boards/microrusefi/meta-info-mre-legacy_f4.env)	5m 42s
build-firmware (uaefi, config/boards/hellen/uaefi/meta-info.env)	4m 59s
build-firmware (hellen121vag, config/boards/hellen/hellen121vag/meta-info.env)	5m 58s
build-firmware (subaru_eg33_f7_no_bl, config/boards/subaru_eg33/meta-info-subaru_eg33_f7_no_bl.env)	6m 6s
	1h 27m 29s

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