[nrf fromlist] soc: nordic: nrf54l: Explicitly include autoconf.h

Include configuration file for cases when this file is complied
in special builds (e.g. TFM).

Upstream PR #: 85870

Signed-off-by: Krzysztof Chruściński <[email protected]>

Author: nordic-krch

soc/nordic/nrf54l/soc.c

@@ -12,6 +12,9 @@
  * for the Nordic Semiconductor nRF54L family processor.
  */
 
+/* Include autoconf for cases when this file is used in special build (e.g. TFM) */
+#include <zephyr/autoconf.h>
+
 #include <zephyr/devicetree.h>
 #include <zephyr/kernel.h>
 #include <zephyr/devicetree.h>