FSL: Moved BR_PHYS_ADDR for localbus to common header

The BR_PHYS_ADDR macro is useful on all machines that have local bus
which is pretty much all 83xx/85xx/86xx chips.

Additionally most 85xx & 86xx will need it if they want to support
36-bit physical addresses.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Andy Fleming <afleming@freescale.com>