ARM: omap2plus_defconfig: Enable ISP176x USB driver

The Logic PD Torpedo baseboard has an ISP1763 USB controller attached
to the GPMC bus.  Enable the driver as a module.

Signed-off-by: Adam Ford <aford173@gmail.com>

Message-Id: <20220221184107.2321951-1-aford173@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>