The davinci pre-kernel boot code assumes that all platforms use
the same UART base address for the console.  That assumption
is not longer valid with some newer SoCs so determine the console
UART base address from the machine number passed in from u-boot.
Signed-off-by: Mark A. Greer <mgreer@mvista.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>