Chipidea: Set connect-at-fullspeed bit when entering host mode if...

Chipidea: Set connect-at-fullspeed bit when entering host mode if CI_HDRC_FORCE_FULLSPEED is set in the platform data

PORTSC_PFSC is not set on entering host mode which means the USB OTG
controller will attempt to enumerate USB devices at high speed even when the
CI_HDRC_FORCE_FULLSPEED flag is set in the platform data.

This patch ensures it is set right before host mode operations begin if needed.

Signed-off-by: Daniel Tang <dt.tangr@gmail.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>