imx: mach: correct SCU API usage

The return value is int type, not sc_err_t(u8), correct the usage.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/cmd_dek.c b/arch/arm/mach-imx/cmd_dek.c
index 69ed575..d77a49d 100644
--- a/arch/arm/mach-imx/cmd_dek.c
+++ b/arch/arm/mach-imx/cmd_dek.c
@@ -154,7 +154,7 @@
 
 static int blob_encap_dek(u32 src_addr, u32 dst_addr, u32 len)
 {
-	sc_err_t err;
+	int err;
 	sc_rm_mr_t mr_input, mr_output;
 	struct generate_key_blob_hdr hdr;
 	u8 in_size, out_size;