drivers: atmel_shdwc: add call to suspend init

Since there is no "suspend" controller per se and that the general
controller used for suspend is the shutdown controller, call suspend
init from shdwc driver.

Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Clément Léger <clement.leger@bootlin.com>

core/arch/arm/plat-sam/conf.mk

@@ -67,5 +67,6 @@ ifeq ($(CFG_ATMEL_PM),y)
 # 4 = BACKUP
 CFG_ATMEL_PM_SUSPEND_MODE ?= 0
 
+$(call force,CFG_ATMEL_SHDWC,y)
 $(call force,CFG_PM_ARM32,y)
 endif

core/drivers/atmel_shdwc.c

@@ -7,6 +7,7 @@
 
 #include <drivers/atmel_shdwc.h>
 #include <drivers/sam/at91_ddr.h>
+#include <drivers/pm/sam/atmel_pm.h>
 #include <io.h>
 #include <kernel/dt.h>
 #include <kernel/thread.h>
@@ -166,7 +167,7 @@ static TEE_Result atmel_shdwc_probe(const void *fdt, int node,
 
 	at91_shdwc_dt_configure(fdt, node);
 
-	return TEE_SUCCESS;
+	return sama5d2_pm_init(fdt, shdwc_base);
 }
 
 static const struct dt_device_match atmel_shdwc_match_table[] = {