defconfig: Enable USB PHY drivers for QCS405

For QCS405 enable the required SNPS HS PHY and
SS PHY drivers.
Enable extcon-usb-gpio driver to support GPIO based
VBUS and ID detection.

Change-Id: I9b943934df4815b745fbf61a677884dc2590e6f2
Signed-off-by: Sriharsha Allenki <sallenki@codeaurora.org>