[RFC] Align tegra-ehci DMA transfers to 32B

[Robert Morell]

This small set of patches fixes an issue where DMA from the tegra EHCI
controller could be corrupted.  It was most commonly seen with USB network
adapters, though in theory it could happen with any USB traffic.

(Note: An attempt was made to fix this with commit 367c3aab, which set
NET_IP_ALIGN to 0 and NET_SKB_PAD to 32.  Unfortunately, not all network
drivers honor them (presumably since these are intended as optimizations rather
than hard rules).  This does mean that properly-written network drivers should
fall through this code with very little overhead, however.)

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