imx8: cpu: fix mac fuse word for i.MX8QM

i.MX8QM does not share same FUSE MAC word index, so update the word
index for i.MX8QM.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx8/cpu.c b/arch/arm/mach-imx/imx8/cpu.c
index 4e6120c..d393a01 100644
--- a/arch/arm/mach-imx/imx8/cpu.c
+++ b/arch/arm/mach-imx/imx8/cpu.c
@@ -475,10 +475,17 @@
 }
 #endif
 
+#if defined(CONFIG_IMX8QM)
+#define FUSE_MAC0_WORD0 452
+#define FUSE_MAC0_WORD1 453
+#define FUSE_MAC1_WORD0 454
+#define FUSE_MAC1_WORD1 455
+#elif defined(CONFIG_IMX8QXP)
 #define FUSE_MAC0_WORD0 708
 #define FUSE_MAC0_WORD1 709
 #define FUSE_MAC1_WORD0 710
 #define FUSE_MAC1_WORD1 711
+#endif
 
 void imx_get_mac_from_fuse(int dev_id, unsigned char *mac)
 {