chore: use tabs for indentation

This patch changes the definition of image_info_t to follow the TF-A
coding style documented at
https://trustedfirmware-a.readthedocs.io/en/latest/process/coding-style.html

Signed-off-by: Jorge Troncoso <jatron@google.com>
Change-Id: I17af22b4ba60b41cf0b5fa84ac47beeb1536edcc

include/export/common/bl_common_exp.h

@@ -39,8 +39,8 @@
  *****************************************************************************/
 typedef struct image_info {
 	param_header_t h;
-	uintptr_t image_base;   /* physical address of base of image */
-	uint32_t image_size;    /* bytes read from image file */
+	uintptr_t image_base;	/* physical address of base of image */
+	uint32_t image_size;	/* bytes read from image file */
 	uint32_t image_max_size;
 } image_info_t;