defconfig: msm8994: Enable QPNP_USB_DETECT

Some platforms may use PMIC GPIO for USB VBUS detection.
Enable this driver which handles the GPIO interrupt and
relays the notification to the USB driver.

Change-Id: If926d89da0d46c539d6e8c49ac9db753989630c9
Signed-off-by: Jack Pham <jackp@codeaurora.org>