uboot-imx

mxs: Squash the header file usage in ehci-mxs

The ehci-mxs driver included the register definitions directly.
Use imx-regs.h instead since it contains proper handling of the
differences between mx23 and mx28.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>