zephyr: Add NRF54L configuration #1816

Job	Run time
config (RELEASE 2,4,6 SIGNATURE)	9m 3s
config (RELEASE 2,4,6 SIGNATURE LOW)	13m 9s
config (RELEASE 2,4,6 SIGNATURE MEDIUM)	17m 26s
config (RELEASE 8,10 SIGNATURE)	6m 34s
config (RELEASE 8,10 SIGNATURE LOW)	9m 16s
config (RELEASE 8,10 SIGNATURE MEDIUM)	12m 1s
config (MINSIZEREL 2,4,6 SIGNATURE)	15m 5s
config (MINSIZEREL 2,4,6 SIGNATURE LOW)	20m 1s
config (MINSIZEREL 2,4,6 SIGNATURE MEDIUM)	23m 45s
config (MINSIZEREL 8,10 SIGNATURE)	10m 28s
config (MINSIZEREL 8,10 SIGNATURE LOW)	13m 46s
config (MINSIZEREL 8,10 SIGNATURE MEDIUM)	16m 27s
	2h 47m 1s

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