Fix pwm-related build failure

Commit 076762aa is adding a macro whis is
calling imx_add_mxc_pwm() but gives it 2 parameters while it's taking only
one parameters.
Signed-off-by: NArnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>

arch/arm/mach-mx5/devices-imx51.h

@@ -49,8 +49,8 @@ extern const struct imx_imx2_wdt_data imx51_imx2_wdt_data[] __initconst;
 	imx_add_imx2_wdt(&imx51_imx2_wdt_data[id])
 
 extern const struct imx_mxc_pwm_data imx51_mxc_pwm_data[] __initconst;
-#define imx51_add_mxc_pwm(id, pdata)	\
-	imx_add_mxc_pwm(&imx51_mxc_pwm_data[id], pdata)
+#define imx51_add_mxc_pwm(id)	\
+	imx_add_mxc_pwm(&imx51_mxc_pwm_data[id])
 
 extern const struct imx_imx_keypad_data imx51_imx_keypad_data __initconst;
 #define imx51_add_imx_keypad(pdata)	\