proc/process_load (NOMMU): fix phdr size check #1858

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	24s
call-ci / build (armv7a9-zynq7000-qemu)	24s
call-ci / build (armv7a9-zynq7000-zedboard)	26s
call-ci / build (armv7a9-zynq7000-zturn)	20s
call-ci / build (armv7m4-stm32l4x6-nucleo)	24s
call-ci / build (armv7m7-imxrt105x-evk)	25s
call-ci / build (armv7m7-imxrt106x-evk)	24s
call-ci / build (armv7m7-imxrt117x-evk)	25s
call-ci / build (host-generic-pc)	23s
call-ci / build (ia32-generic-pc)	25s
call-ci / build (ia32-generic-qemu)	23s
call-ci / build (riscv64-generic-qemu)	23s
call-ci / build (riscv64-generic-spike)	23s
call-ci / build (sparcv8leon3-gr716-mini)	23s
call-ci / test HW	0s
call-ci / test EMU	0s
call-ci / tests-summary	6s
call-ci / send-notification / send-notif	4s
	5m 42s

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