tools/imximage: use 0x prefix in HAB Blocks line

The u-boot-ivt.img.log file contains 0x prefixes in the HAB Blocks line,
while the SPL.log does not. For consistency, and to make it easier to
extract and put into a .csf file for use with NXP's code signing tool,
add 0x prefixes here.
Signed-off-by: NRasmus Villemoes <rasmus.villemoes@prevas.dk>
Reviewed-by: NFabio Estevam <fabio.estevam@nxp.com>
Tested-by: NBreno Lima <breno.lima@nxp.com>

doc/README.mxc_hab

@@ -33,12 +33,12 @@ Image Ver:    2 (i.MX53/6 compatible)
 Data Size:    327680 Bytes = 320.00 kB = 0.31 MB
 Load Address: 177ff420
 Entry Point:  17800000
-HAB Blocks:   177ff400 00000000 0004dc00
-	      ^^^^^^^^ ^^^^^^^^ ^^^^^^^^
-		|	|	   |
-		|	|	   -------- (1)
-		|	|
-		|	------------------- (2)
+HAB Blocks:   0x177ff400 0x00000000 0x0004dc00
+	      ^^^^^^^^^^ ^^^^^^^^^^ ^^^^^^^^^^
+		|	   |	      |
+		|	   |	      ----- (1)
+		|	   |
+		|	   ---------------- (2)
 		|
 		--------------------------- (3)
 
@@ -78,7 +78,7 @@ Example Output of the SPL (imximage) creation:
  Data Size:    61440 Bytes = 60.00 kB = 0.06 MB
  Load Address: 00907420
  Entry Point:  00908000
- HAB Blocks:   00907400 00000000 0000cc00
+ HAB Blocks:   0x00907400 0x00000000 0x0000cc00
 
 Example Output of the u-boot-ivt.img (firmware_ivt) creation:
  Image Name:   U-Boot 2016.11-rc1-31589-g2a4411

tools/imximage.c

@@ -516,7 +516,7 @@ static void print_hdr_v2(struct imx_header *imx_hdr)
 			offs = (char *)&hdr_v2->data.dcd_table
 				- (char *)hdr_v2;
 
-			printf("HAB Blocks:   %08x %08x %08x\n",
+			printf("HAB Blocks:   0x%08x 0x%08x 0x%08x\n",
 			       (uint32_t)fhdr_v2->self, 0,
 			       hdr_v2->boot_data.size - imximage_ivt_offset -
 			       imximage_csf_size);