In order to make single zImage work for ARM architecture,
we need to make sure we don't depend on private headers.

Move USB platform_data to
and add a minimal drivers/mfd/usb-omap.h.

Cc: Samuel Ortiz
Cc: Alan Stern
Cc: Greg Kroah-Hartman
Cc: Partha Basak
Cc: Keshava Munegowda
Cc: linux-usb@vger.kernel.org
Signed-off-by: Felipe Balbi
[tony@atomide.com: updated for local mfd/usb-omap.h]
Signed-off-by: Tony Lindgren