ARM: ux500: ioremap differences for DB9540

The DB9540 ASIC has bigger PRCMU and PRCMU TCDM memories,
so create a separate mapping table for these.

Signed-off-by: Michel Jaouen <michel.jaouen@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>