Refactor res/values resources to use -land qualifier instead of -port qualifier.

Functional changes: compose.xml layout uses the ComposeArea style which causes
all portrait tablet orientations to have no margin and 80dip padding. This is
desirable.

Bug: 7382467
Change-Id: I45af05211b57d03b51b11895a098828d60f5df7b
22 files changed