eficonfig: fix going one directory up issue

The directory name in eficonfig menu entry contains the
'\' separator. strcmp() argument ".." is wrong and one directory
up handling does not work correctly. strcmp() argument must
include '\' separator.

Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>