imx: move imx8 sci header file to include/firmware/imx

Move imx8 sci header file to include/firmware/imx, then we could
use build macro to reuse some i.MX8 drivers for i.MX9, such as
drivers/cpu/imx8_cpu.c.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Stefano Babic <sbabic@denx.de>
diff --git a/drivers/pinctrl/nxp/pinctrl-scu.c b/drivers/pinctrl/nxp/pinctrl-scu.c
index c032be7..4959834 100644
--- a/drivers/pinctrl/nxp/pinctrl-scu.c
+++ b/drivers/pinctrl/nxp/pinctrl-scu.c
@@ -7,7 +7,7 @@
 #include <errno.h>
 #include <linux/bitops.h>
 #include <asm/io.h>
-#include <asm/arch/sci/sci.h>
+#include <firmware/imx/sci/sci.h>
 #include <misc.h>
 
 #include "pinctrl-imx.h"