Input: cyapa - fix address of Gen3 devices in device tree documentation

All of the Gen3 touchpads are fixed with I2C address 0x67, so correct the
reg value description from 0x24 to 0x67.

Signed-off-by: Dudley Du <dudl@cypress.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>