x86: zimage: Add a little more logging

Add logging for each part of the boot process, using a new

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Igor Opaniuk <igor.opaniuk@toradex.com>
diff --git a/common/log.c b/common/log.c
index 4b6f3fc..ce39918 100644
--- a/common/log.c
+++ b/common/log.c
@@ -26,6 +26,7 @@
 	"bloblist",
 	"devres",
 	"acpi",
+	"boot",
 };
 
 _Static_assert(ARRAY_SIZE(log_cat_name) == LOGC_COUNT - LOGC_NONE,