Kconfig: Add help text to more options

Depthcharge defconfigs can only select options when they are marked
user-selectable (i.e. have a help text). Fix this for a few more options
because it may lead to unexpected bugs.

BRANCH=None
BUG=None
TEST=None

Change-Id: I949baeab3b8936e33091c32dee6fc2ec721602e1
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/1583010
Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Reviewed-by: Duncan Laurie <dlaurie@google.com>
3 files changed