Revert "Start the deprecation process for generic board"

We've run into a non-trivial conversion to CONFIG_SYS_GENERIC_BOARD so
we'll postpone this notice until right after v2014.04 is out.

This reverts commit 36c4b1d98059244c34ec3327d9cc9f3c552fd01b.

Signed-off-by: Tom Rini <trini@ti.com>