Update README.md with NUCLEO-N657X0 board #124

Job	Run time
build (nucleo_h755zi)	37s
build (matek_H7_slim)	36s
build (pixhawk4_ram)	35s
build (matek_H7_slim_ram secure=true)	37s
build (matek_H7_slim_ram)	35s
build (pixhawk4)	35s
build (nucleo_h755zi_ram)	35s
build (matek_H7_slim secure=true)	35s
build (stm32l4xx)	35s
build (stm32h7xx secure=true)	37s
build (stm32f7xx)	32s
build (stm32h735g_dk_ram)	37s
build (stm32h735g_dk)	36s
build (stm32h7xx_ram secure=true)	36s
build (stm32h7xx_ram)	1m 17s
build (stm32f7xx_ram)	36s
build (stm32h7xx)	40s
	10m 51s

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