Add missing values for screen percent width dimens

Protects against bootlooping in the event that developer
inadvertently changes DPI to unsupported value for device.

Use 0dp as it will not be mistaken for anything other
than a broken experience (cts test to validate device DPIs
so as to avoid shipping with this).

bug: b/37755288
Change-Id: Ie9f4aa0d6d226383824e06d28151e06038d0110b