ARM: dts: logicpd-som-lv: Fix Touchscreen controller

The touchscreen patch did not apply to this branch correctly and
inadvertently got placed onto I2C2 when it should be on I2C3.  This fixes
the issue.

Fixes: 121685b1 ("ARM: dts: logicpd-som-lv: Enable Touchscreen
controller")

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>