zephyr: Add NRF54L configuration #1790

Job	Run time
config (RELEASE 2,4,6 SIGNATURE)	8m 56s
config (RELEASE 2,4,6 SIGNATURE LOW)	13m 13s
config (RELEASE 2,4,6 SIGNATURE MEDIUM)	17m 11s
config (RELEASE 8,10 SIGNATURE)	6m 25s
config (RELEASE 8,10 SIGNATURE LOW)	9m 21s
config (RELEASE 8,10 SIGNATURE MEDIUM)	12m 0s
config (MINSIZEREL 2,4,6 SIGNATURE)	14m 59s
config (MINSIZEREL 2,4,6 SIGNATURE LOW)	19m 48s
config (MINSIZEREL 2,4,6 SIGNATURE MEDIUM)	23m 57s
config (MINSIZEREL 8,10 SIGNATURE)	10m 25s
config (MINSIZEREL 8,10 SIGNATURE LOW)	13m 36s
config (MINSIZEREL 8,10 SIGNATURE MEDIUM)	16m 10s
	2h 46m 1s

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