.gitignore: clean-up unnecessary entries

There have been /errlog and /reloc_off in the top level .gitignore
since commit 1b4aaffe added it about 7 years ago.

But they are no longer generated.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/.gitignore b/.gitignore
index 2ddf57f..0ace33b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,11 +44,7 @@
 #
 # Generated files
 #
-
 /LOG
-/errlog
-/reloc_off
-
 /spl/
 /tpl/