elogtool: add to gitignore

Add the binary output of the new elogtool to the .gitignore, so that
running "make -C util/cbfstool" keeps the tree clean.

Signed-off-by: Jack Rosenthal <jrosenth@chromium.org>
Change-Id: I806338a4b33abbc3d55e4edef2736c19d56fa005
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56864
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Ricardo Quesada <ricardoq@google.com>
Reviewed-by: Furquan Shaikh <furquan@google.com>
diff --git a/util/cbfstool/.gitignore b/util/cbfstool/.gitignore
index a63222a..2de3ccb 100644
--- a/util/cbfstool/.gitignore
+++ b/util/cbfstool/.gitignore
@@ -1,5 +1,6 @@
 cbfs-compression-tool
 cbfstool
+elogtool
 fmaptool
 ifittool
 ifwitool