arm64: defconfig: Enable extcon USB GPIO driver on Lahaina

extcon USB gpio driver is used to start USB host/device mode
based on vbus/ID status for USB secondary port. Hence enable
extcon USB GPIO driver on Lahaina.

Change-Id: Ia39822f29e9c1387df1827eef89c56d29df2554a
Signed-off-by: Mayank Rana <mrana@codeaurora.org>