[PATCH] ppc32: Make the UARTs on MPC824x individual platform devices

The UARTs on the MPC824x are unique devices and really shouldn't be thought
of as a DUART.  In addition, if both UARTs are in use we need to configure
the part to enable the 2nd UART since the pins for the UARTs are
multiplexed.  Adds support to run the 824x Sandpoint with both UARTs if
desired.

Signed-off-by: Matt McClintock <msm@freescale.com>
Signed-off-by: Kumar Gala <kumar.gala@freescale.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>