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

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

Signed-off-by: Peter Chen <redacted>
---
 drivers/usb/host/fsl-mph-dr-of.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/host/fsl-mph-dr-of.c b/drivers/usb/host/fsl-mph-dr-of.c
index 7916e56..ab333ac 100644
--- a/drivers/usb/host/fsl-mph-dr-of.c
+++ b/drivers/usb/host/fsl-mph-dr-of.c

@@ -94,7 +94,6 @@ struct platform_device * __devinit fsl_usb2_device_register(
 	pdev->dev.parent = &ofdev->dev;
 
 	pdev->dev.coherent_dma_mask = ofdev->dev.coherent_dma_mask;
-	pdev->dev.dma_mask = &pdev->archdata.dma_mask;
 	*pdev->dev.dma_mask = *ofdev->dev.dma_mask;
 
 	retval = platform_device_add_data(pdev, pdata, sizeof(*pdata));

-- 
1.7.0.4