test/driver/build_all: Modify the dts configure example of board for it8801

Modify the board file when using gpio, input and pwm drivers dts
configuration example for it8801.

test: west build -p always -b it82xx2_evb tests/drivers/build_all/gpio
      west build -p always -b it82xx2_evb tests/drivers/build_all/input
      west build -p always -b it82xx2_evb tests/drivers/build_all/pwm

Signed-off-by: Tim Lin <tim2.lin@ite.corp-partner.google.com>