arm64: dts: exynos: drop pwm-names from MAX77843 haptic in TM2

MAX77843 haptic driver does not take 'pwm-names' property:

  exynos5433-tm2.dtb: pmic@66: motor-driver: 'pwm-names' does not match any of the regexes: 'pinctrl-[0-9]+'

Link: https://lore.kernel.org/r/20221204113839.151816-1-krzysztof.kozlowski@linaro.org


Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>