plat/arm: scmi: Move to drivers/ folder

Change-Id: I8989d2aa0258bf3b50a856c5b81532d578600124
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/plat/arm/css/sgi/sgi_bl31_setup.c b/plat/arm/css/sgi/sgi_bl31_setup.c
index 5324482..82d8fed 100644
--- a/plat/arm/css/sgi/sgi_bl31_setup.c
+++ b/plat/arm/css/sgi/sgi_bl31_setup.c
@@ -10,12 +10,12 @@
 
 #include <common/bl_common.h>
 #include <common/debug.h>
+#include <drivers/arm/css/scmi.h>
 #include <plat/arm/common/plat_arm.h>
 
 #include <sgi_ras.h>
 #include <sgi_variant.h>
 
-#include "../../css/drivers/scmi/scmi.h"
 #include "../../css/drivers/mhu/css_mhu_doorbell.h"
 
 sgi_platform_info_t sgi_plat_info;