imx9: soc: Print UID in big endian format for EL2GO

Print UID in big endian format and as one buffer of bytes, so customer
can directly use it for EdgeLock 2GO.

Before:
UID: 0xf6c8ae93 0x0f46b326 0x10d61eb3 0x0583c2d2

Become:
UID: 93aec8f626b3460fb31ed610d2c28305

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/mach-imx/imx9/soc.c b/arch/arm/mach-imx/imx9/soc.c
index 6dcf0c4..bdc569b 100644
--- a/arch/arm/mach-imx/imx9/soc.c
+++ b/arch/arm/mach-imx/imx9/soc.c
@@ -560,8 +560,9 @@
 #if defined(CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG)
 void get_board_serial(struct tag_serialnr *serialnr)
 {
-	printf("UID: 0x%x 0x%x 0x%x 0x%x\n",
-	       gd->arch.uid[0], gd->arch.uid[1], gd->arch.uid[2], gd->arch.uid[3]);
+	printf("UID: %08x%08x%08x%08x\n", __be32_to_cpu(gd->arch.uid[0]),
+	       __be32_to_cpu(gd->arch.uid[1]), __be32_to_cpu(gd->arch.uid[2]),
+	       __be32_to_cpu(gd->arch.uid[3]));
 
 	serialnr->low = __be32_to_cpu(gd->arch.uid[1]);
 	serialnr->high = __be32_to_cpu(gd->arch.uid[0]);