defconfig: 9615: allow both hsic and usb to compile as modules.

This creates an image that contains both hsic and usb as modules,
which can be then insmoded at boot-time (in the usb script) upon
each reboot.

Change-Id: I4afd900bdf969bd8f29aeec818a336822e235857
Signed-off-by: Amit Blay <ablay@codeaurora.org>
Signed-off-by: Lena Salman <esalman@codeaurora.org>