staging: tidspbridge: add memory consistency to TODO list

This driver uses ioremap on regular memory to get an uncached mapping,
which causes problems on ARMv6 and higher due to aliasing with the
cached linar kernel mapping.

Make sure this gets fixed before the driver graduates from staging.

Cc: Felipe Contreras <felipe.contreras@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>