bus: brcmstb_gisb: Honor the "big-endian" and "native-endian" DT properties
bus: brcmstb_gisb: Honor the "big-endian" and "native-endian" DT properties

On chips strapped for BE, we'll need to use ioread32be/iowrite32be instead of
ioread32/iowrite32.

Signed-off-by: Kevin Cernekee <3105dbb3dd63fbb4f6371cfb04adc6726f76c56b@gmail.com>
Signed-off-by: Florian Fainelli <59190c1867e3222b932a0de3c668eb2d980d69a2@gmail.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs