imx8: Change default M4 partition to 1

Default M4 partition should be 1 same as A core partition, not the 0.
Otherwise M4 has to specify the -p1 for its standalone build
Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit 5e9a4be871e0e53b9ec6700a9f793ce163eb9c12)

src/mkimage_common.h

@@ -147,7 +147,7 @@ typedef struct {
 #define SC_R_M4_0_MU_1A 297
 #define SC_R_M4_1_PID0  298
 #define SC_R_M4_1_MU_1A 317
-#define PARTITION_ID_M4 0
+#define PARTITION_ID_M4 1
 #define PARTITION_ID_AP 1
 
 /* Command tags and parameters */