"barebox_default_env*" is not "Top-level generic files" because they
are generated in the defaultenv/ directory since commit 7fa10256c3
(defaultenv: Allow multiple defaultenvironment overlays).
The comment block of the top-level .gitignore says as follows:
# NOTE! Don't add files that are generated in specific
# subdirectories here. Add them in the ".gitignore" file
# in that subdirectory instead.
Let's follow this rule.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>