x86: zboot: Rename zboot_start() to zboot_run()

The term 'start' is used withint bootm and zboot to indicate the first
phase of booting an image.

Since zboot_start() does the whole boot, rename it to zboot_run() to
align with bootm_run() etc.

Fix a log message while we are here.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c
index b72e2f0..e8a1849 100644
--- a/arch/x86/lib/zimage.c
+++ b/arch/x86/lib/zimage.c
@@ -437,8 +437,8 @@
 	return ret;
 }
 
-int zboot_start(ulong addr, ulong size, ulong initrd, ulong initrd_size,
-		ulong base, char *cmdline)
+int zboot_run(ulong addr, ulong size, ulong initrd, ulong initrd_size,
+	      ulong base, char *cmdline)
 {
 	int ret;
 
@@ -463,7 +463,7 @@
 		return log_msg_ret("set", ret);
 	ret = zboot_go();
 	if (ret)
-		return log_msg_ret("set", ret);
+		return log_msg_ret("go", ret);
 
 	return -EFAULT;
 }