[nrf fromlist] soc: nordic: nrf54l: add preliminary workaround for nRF54L anomaly 31

This workaround will be replaced with a variant
executed at SystemInit() level, once MDK implements it.

Upstream PR #: 82268

Signed-off-by: Nikodem Kastelik <[email protected]>
(cherry picked from commit 9bb619d)

Author: nika-nordic

soc/nordic/nrf54l/soc.c

@@ -38,6 +38,7 @@
 #endif
 #include <soc/nrfx_coredep.h>
 
+#include <nrf_erratas.h>
 #include <system_nrf54l.h>
 
 LOG_MODULE_REGISTER(soc, CONFIG_SOC_LOG_LEVEL);
@@ -154,6 +155,13 @@ static inline void power_and_clock_configuration(void)
 	}
 
 #if (DT_PROP(DT_NODELABEL(vregmain), regulator_initial_mode) == NRF5X_REG_MODE_DCDC)
+#if NRF54L_ERRATA_31_ENABLE_WORKAROUND
+	/* Workaround for Errata 31 */
+	if (nrf54l_errata_31()) {
+		*((volatile uint32_t *)0x50120624ul) = 20 | 1<<5;
+		*((volatile uint32_t *)0x5012063Cul) &= ~(1<<19);
+	}
+#endif
 	nrf_regulators_vreg_enable_set(NRF_REGULATORS, NRF_REGULATORS_VREG_MAIN, true);
 #endif