board: Remove essentially empty board files and Makefiles

As part of reviewing a new platform, Daniel Schwierzeck confirmed that
if we don't have a Makefile in the board directory we also don't need an
empty board.c file in the board directory and instead things just build
as expected.  Use this knowledge to clean up a number of platforms that
had empty board.c files and a Makefile just for that file.

Signed-off-by: Tom Rini <trini@konsulko.com>
115 files changed