Disable app usage item if this item is not clickable

some items are not clickable to launch the restriction page in the
battery usage list, we will apply the disabled visual in the
preferrence item to improve the UX (avoid users click the item without
any action)

Bug: 188751551
Bug: 188663505
Test: make SettingsgRoboTests
Change-Id: Ib8925b8e191117543bb1c74d6d01191e3043fc73