soc/intel: Drop indirect <soc/nvs.h> include

Change-Id: Ia19018685749efdd543cb09c06df117690ab9d66
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/48803
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/acpi.c

@@ -23,6 +23,7 @@
 #include <soc/cpu.h>
 #include <soc/iomap.h>
 #include <soc/msr.h>
+#include <soc/nvs.h>
 #include <soc/pci_devs.h>
 #include <soc/pm.h>
 #include <soc/ramstage.h>