Restore DroidSansFallback to fonts.xml

The font was mistakenly removed in
Ib69e73a6682d7eedd7b824f1dadc79cbccf07605, while it is still built
for SMALLER_FONT_FOOTPRINT devices.

Change-Id: Icb62ef6ef7445255191c70110a2b5eb4105628ce
1 file changed