Rephrase summary texts on permission & app chips for Wear

Rephrase grant type on the chips to remove duplication,
and shorten `Last access` strings.

Screenshot: https://screenshot.googleplex.com/BiMYHQp337hwLoV
https://screenshot.googleplex.com/8biXcVkQf5Kx7wG

Bug: 315908771
Test: Privacy dashboard -> Choose a permission -> check the summary on the chip
Change-Id: I06de998283991944f327d34abddda667089b26c8