Add screen layout size as one of the resource filtering axes.

So that we can add screen layout size such as
"small/normal/large/xlarge" to PRODUCT_LOCALES to filter unwanted
resources. We already handle screen density this way.
Bug: 4086309

Change-Id: I0867e22a825faea0e100d8a0075f0f5cb7c0c964
1 file changed