mpc8641: Try to detect old .dts files

mpc8641: Try to detect old .dts files

Since we've changed the memory map of the board, be nice and
add some checking to try to catch out-of-date .dts files.  We do
this by checking the CCSRBAR location in the .dts and comparing
it to the CCSRBAR location in u-boot.  If they don't match, a
warning msg is printed.  This isn't foolproof, but it's simple and
will catch most of the cases where an out-of-date .dts is present,
including all of the cases where a new u-boot is used with an old
standard MPC8641 .dts file as supplied with Linux.

Signed-off-by: Becky Bruce <becky.bruce@freescale.com>