pvr: Add PVR_DW_TO_BYTES()
We use dwords (32 bit) quite a bit around the code base. Previously we used '* 4', '<< 2', or '* sizeof(uint32_t)' to go from dwords to bytes. The conversion isn't always clear when other operations happen in the same line, which can leave one wondering where the multiplication came from. PVR_DW_TO_BYTES() should make the code more obvious as well as making the conversion more consistent.
Signed-off-by: Karmjit Mahil Karmjit.Mahil@imgtec.com
Draft for now since this is a bit outdated now so will need a check through the code base again to see if the macro can be used in other places.