touch_noise_filter: Remove default value for BASE_VER

BASE_VER must match the recent version of libchrome being used.
Having it set to a dummy default version that doesn't match the revision
number of libchrome doesn't help anyone much.

Removed the default value and added an error message instructing
the user to set BASE_VER to correct revision number if not already
set (which is the case in normal builds, where BASE_VER comes from
libchrome.eclass).

BUG=None
TEST=emerge-link touch_noise_filter

Change-Id: I8f1f780dc9751cf096156b8e7414c50a17b5a5ea
Reviewed-on: https://chromium-review.googlesource.com/264104
Trybot-Ready: Alex Vakulenko <avakulenko@chromium.org>
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
1 file changed