include: enable usb notifier for pm88x

usb notifier is used to notify usb framework
vbus and votg status, and it is controlled
by macro, if macro is not defined, default
notify functions do nothing, so
CONFIG_VBUS_88PM88X is necessary to enable
these extern functions.

Change-Id: I1a30295a960413588b5dc875a2c2df2797f55368
Signed-off-by: Yaowei Li <ywli@marvell.com>
1 file changed