kconfig: remove trailing whitespaces

There are still some trailing whitespaces under scripts/kconfig/tests/,
but they must be kept. Otherwise, "make testconfig" would break.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

kconfig: move lxdialog to scripts/kconfig/lxdialog

The only lxdialog user i kconfig - for menuconfig.
So move it to reflect this.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>