microblaze: Use generic device.h

pdev_archdata dma_mask is completely unused.
Use generic device.h

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

diff --cc arch/microblaze/include/asm/Kbuild
Simple merge

diff --cc arch/microblaze/include/asm/device.h
Simple merge

diff --cc drivers/of/platform.c
Simple merge