[RFC] usb: Fix build error due to dma_mask is not at pdev_archdata at ARM

[Chen Peter-B29397]

> When build i.mx platform with imx_v6_v7_defconfig, and after adding USB
> Gadget support, it has below build error:
> 
> CC      drivers/usb/host/fsl-mph-dr-of.o
> drivers/usb/host/fsl-mph-dr-of.c: In function 'fsl_usb2_device_register':
> drivers/usb/host/fsl-mph-dr-of.c:97: error: 'struct pdev_archdata'
> has no member named 'dma_mask'
> 
> It has discussed at: http://www.spinics.net/lists/linux-usb/msg57302.html
> 
> For PowerPC, there is dma_mask at struct pdev_archdata, but there is no
> dma_mask at struct pdev_archdata for ARM. The pdev_archdata is related to
> specific platform, it should NOT be accessed by cross platform drivers,
> like USB.
> 
> The code for pdev_archdata should be useless, as for PowerPC, it has
> already gotten the value for pdev->dev.dma_mask at function
> arch_setup_pdev_archdata of arch/powerpc/kernel/setup-common.c.
> 
> Anyone who has PowerPC hardware with USB host enabled, and uses this code
> can help me a test? Thank you
> 
> [Ramneek]: Hi Peter, the code is working for Host stack on PowerPC.
 
Thanks, Ramneek. I will post PATCH and add:
Tested-by: Ramneek Mehresh <ramneek.mehresh at freescale.com>