ARM: pxa: hx4700: Remove unused field initializers

The ID and period for the backlight PWM are obtained from a PWM lookup
table, so the corresponding values don't need to be duplicated into the
platform data.

Cc: Daniel Mack <daniel@zonque.org>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Acked-by: Philipp Zabel <philipp.zabel@gmail.com>
Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>

arch/arm/mach-pxa/hx4700.c

@@ -557,10 +557,8 @@ static struct platform_device hx4700_lcd = {
  */
 
 static struct platform_pwm_backlight_data backlight_data = {
-	.pwm_id         = -1,	/* Superseded by pwm_lookup */
 	.max_brightness = 200,
 	.dft_brightness = 100,
-	.pwm_period_ns  = 30923,
 	.enable_gpio    = -1,
 };