how to init/config pwm3 in the uboot of android 5.0 / Imx6dl.

[尚飞汤]

	imx_pwm_config(pwm2, 25000, 50000);
	imx_pwm_enable(pwm2);

above is android 4.2 in uboot .

but the android 5.0 of imx6dl has no imx_pwm.c file，then，how to config it in the uboot?