pwm: imx: add Kconfig support

add Kconfig support for this driver.

Signed-off-by: Heiko Schocher <hs@denx.de>
Acked-by: Martyn Welch <martyn.welch@collabora.co.uk>
diff --git a/configs/aristainetos2b_defconfig b/configs/aristainetos2b_defconfig
index 06c05f7..34a6cde 100644
--- a/configs/aristainetos2b_defconfig
+++ b/configs/aristainetos2b_defconfig
@@ -48,6 +48,7 @@
 CONFIG_PHY_MICREL=y
 CONFIG_PHY_MICREL_KSZ90X1=y
 CONFIG_MII=y
+CONFIG_PWM_IMX=y
 CONFIG_SPI=y
 CONFIG_MXC_SPI=y
 CONFIG_USB=y