mmap: make interface posix compliant #1333

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	47s
call-ci / build (armv7a9-zynq7000-qemu)	49s
call-ci / build (armv7a9-zynq7000-zedboard)	55s
call-ci / build (armv7a9-zynq7000-zturn)	55s
call-ci / build (armv7m4-stm32l4x6-nucleo)	57s
call-ci / build (armv7m7-imxrt105x-evk)	50s
call-ci / build (armv7m7-imxrt106x-evk)	50s
call-ci / build (armv7m7-imxrt117x-evk)	55s
call-ci / build (host-generic-pc)	59s
call-ci / build (ia32-generic-pc)	50s
call-ci / build (ia32-generic-qemu)	51s
call-ci / build (riscv64-generic-qemu)	52s
call-ci / build (riscv64-generic-spike)	46s
call-ci / build (sparcv8leon3-gr716-mini)	1m 0s
call-ci / test EMU	0s
call-ci / test HW	0s
call-ci / tests-summary	12s
call-ci / send-notification	0s
	12m 28s

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