usb: misc: NB7VPQ904M : do not disable chip for no usb func hub suspend

There is DP HUB which have no usb function, when suspend, do not disable
chip which will keep dp signal path working for display requirement.

Change-Id: I79bf70eac40ccaa54716285cec4fbfa2e2ec34f6
Signed-off-by: Linyu Yuan <linyyuan@codeaurora.org>