bootz: un-staticize do_bootz

Make do_bootz available for other functions like do_bootm is.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c
index 05130b6..e452fca 100644
--- a/common/cmd_bootm.c
+++ b/common/cmd_bootm.c
@@ -1707,7 +1707,7 @@
 	return 0;
 }
 
-static int do_bootz(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_bootz(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 {
 	bootm_headers_t	images;
 
diff --git a/include/command.h b/include/command.h
index 65692fd..9e05ddc 100644
--- a/include/command.h
+++ b/include/command.h
@@ -110,6 +110,8 @@
 }
 #endif
 
+extern int do_bootz(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
+
 extern int common_diskboot(cmd_tbl_t *cmdtp, const char *intf, int argc,
 			   char *const argv[]);