usb: dwc2: Fix DMA alignment to start at allocated boundary

The commit 3bc04e28 ("usb: dwc2: host: Get aligned DMA in a more
supported way") introduced a common way to align DMA allocations.
The code in the commit aligns the struct dma_aligned_buffer but the
actual DMA address pointed by data[0] gets aligned to an offset from
the allocated boundary by the kmalloc_ptr and the old_xfer_buffer
pointers.

This is against the recommendation in Documentation/DMA-API.txt which
states:

  Therefore, it is recommended that driver writers who don't take
  special care to determine the cache line size at run time only map
  virtual regions that begin and end on page boundaries (which are
  guaranteed also to be cache line boundaries).

The effect of this is that architectures with non-coherent DMA caches
may run into memory corruption or kernel crashes with Unhandled
kernel unaligned accesses exceptions.

Fix the alignment by positioning the DMA area in front of the allocation
and use memory at the end of the area for storing the orginal
transfer_buffer pointer. This may have the added benefit of increased
performance as the DMA area is now fully aligned on all architectures.

Tested with Lantiq xRX200 (MIPS) and RPi Model B Rev 2 (ARM).

Fixes: 3bc04e28

 ("usb: dwc2: host: Get aligned DMA in a more supported way")
Cc: <stable@vger.kernel.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>