Currently we have the following behavior in ehci_hcd_init()

- Read csmr1 register, clear bit 26 and then set bit 26.

However a little bit later we call set_usb_phy_clk() which clears bit 26, so
let's get rid of the unnecessary code.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>