The 'all' target has a special meaning to ninja, and it would
complain about having two 'all' targets. Fix this by using a
capital 'a'.

BUG=None

Change-Id: I3ce2aab8df4bdfc8f49361f514881005547c51bf
Reviewed-on: https://chromium-review.googlesource.com/272258Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>