drivers: pwm: pwm-imx: move pwm-imx-util into pwm-imx

Move pwm_imx_get_parms, pwm_id_to_reg functions into pwm-imx.c
and drop off pwm-imx-util.c

Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index bd119a6..e4d10c8 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -15,7 +15,7 @@
 obj-$(CONFIG_PWM_CADENCE_TTC)	+= pwm-cadence-ttc.o
 obj-$(CONFIG_PWM_CROS_EC)	+= cros_ec_pwm.o
 obj-$(CONFIG_PWM_EXYNOS)	+= exynos_pwm.o
-obj-$(CONFIG_PWM_IMX)		+= pwm-imx.o pwm-imx-util.o
+obj-$(CONFIG_PWM_IMX)		+= pwm-imx.o
 obj-$(CONFIG_PWM_MESON)		+= pwm-meson.o
 obj-$(CONFIG_PWM_MTK)		+= pwm-mtk.o
 obj-$(CONFIG_PWM_ROCKCHIP)	+= rk_pwm.o