TQM85xx: Fix bug introduced by 83xx/85xx/86xx: LBC register cleanup

The size of the other bank needed to be added to the br0 setting;
this got dropped in the LBC cleanup.

Signed-off-by: Becky Bruce <beckyb@kernel.crashing.org>
Tested-by: Wolfgang Denk <wd@denx.de>
Acked-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>