mkimage: Make genimg_print_size() global

Currently it is used by image.c only, but the the function can be
used to support additional mkimage types like for example kwbimage,
so make this function globally visible.

Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>

Edited commit message.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/common/image.c b/common/image.c
index f3dd647..ca8205c 100644
--- a/common/image.c
+++ b/common/image.c
@@ -158,7 +158,6 @@
 
 uint32_t crc32 (uint32_t, const unsigned char *, uint);
 uint32_t crc32_wd (uint32_t, const unsigned char *, uint, uint);
-static void genimg_print_size (uint32_t size);
 #if defined(CONFIG_TIMESTAMP) || defined(CONFIG_CMD_DATE) || defined(USE_HOSTCC)
 static void genimg_print_time (time_t timestamp);
 #endif
@@ -473,7 +472,7 @@
 }
 #endif /* !USE_HOSTCC */
 
-static void genimg_print_size (uint32_t size)
+void genimg_print_size (uint32_t size)
 {
 #ifndef USE_HOSTCC
 	printf ("%d Bytes = ", size);