soc: arm: nordic_nrf: add support for Nordic nrf54l family

Add soc files for new Nordic family.

Signed-off-by: Witold Lukasik <witold.lukasik@nordicsemi.no>

soc/arm/nordic_nrf/nrf54l/Kconfig.soc

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+# Nordic Semiconductor nRF54 MCU line
+
+# Copyright (c) 2024 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+if SOC_SERIES_NRF54LX
+
+config SOC_NRF54L15
+	bool "NRF54L15"
+
+config SOC_NRF54L15_ENGA
+	bool "NRF54L15 ENGA"
+	select SOC_NRF54L15
+
+config SOC_NRF54L15_ENGA_CPUAPP
+	bool "NRF54L15 ENGA CPUAPP"
+	select ARM
+	select ARMV8_M_DSP
+	select CPU_CORTEX_M33
+	select CPU_HAS_ARM_MPU
+	select CPU_HAS_ICACHE
+	select CPU_HAS_ARM_SAU
+	select CPU_HAS_FPU
+	select HAS_HW_NRF_RADIO_IEEE802154
+	select HAS_POWEROFF
+	select SOC_NRF54L15_ENGA
+
+config SOC_NRF54LX_SKIP_CLOCK_CONFIG
+	bool "Skip clock frequency configuration in system initialization"
+	help
+	  With this option, the CPU clock frequency is not set during system initialization.
+	  The CPU runs with the default, hardware-selected frequency.
+
+config SOC_NRF_FORCE_CONSTLAT
+	bool "Force constant-latency mode"
+	help
+	  In constant latency mode the CPU wakeup latency and the PPI task response
+	  will be constant and kept at a minimum. This is secured by forcing a set
+	  of base resources on while in sleep. The advantage of having a constant
+	  and predictable latency will be at the cost of having increased power consumption.
+
+config SOC_NRF54L_VREG_MAIN_DCDC
+	bool "NRF54L DC/DC converter."
+	help
+	  To enable, an inductor must be connected to the DC/DC converter pin.
+
+config SOC_NRF54L_NORMAL_VOLTAGE_MODE
+	bool "NRF54L Normal Voltage Mode."
+
+config SOC_NRF54L_GLITCHDET_WORKAROUND
+	bool "Workaround that disables glitch detector"
+	default y
+	help
+	  Temporary workaround - disabling glitch detector to limit power consumption.
+
+if NRF_GRTC_TIMER
+
+config ELV_GRTC_LFXO_ALLOWED
+	bool
+	depends on NRF_GRTC_SLEEP_ALLOWED
+	select EXPERIMENTAL
+	help
+	  This feature allows using ELV mode when GRTC operates with the LFXO as
+	  a low-frequency clock source. The LFXO is automatically activated when
+	  preparing to system-off.
+	  WARNING! This feature is EXPERIMENTAL and may brick your device!
+
+endif # NRF_GRTC_TIMER
+
+endif # SOC_SERIES_NRF54LX