MLK-10101-2 usb: chipidea: otg: delay to enter low power mode for a_host

There is 2s delay for controller resume from usb wakeup case already,
in OTG fsm mode, A-dev can start a new session via sys input file(means
not via usb wakeup), in this case, A-dev still need the 2s delay for
host root hub access registers, otherwise system will hang due to access
register at low power mode.

Signed-off-by: Li Jun <jun.li@freescale.com>

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