ARM: OMAP: update ads7846 x_plate_ohm for N770

Change the X plate resistance so that user-space gets the pressure
value range it expects.
Signed-off-by: Imre Deak <imre.deak@nokia.com>
Signed-off-by: Juha Yrjola <juha.yrjola@nokia.com>

arch/arm/mach-omap1/board-nokia770.c

@@ -93,7 +93,7 @@ static struct platform_device *nokia770_devices[] __initdata = {
 static struct ads7846_platform_data nokia770_ads7846_platform_data __initdata = {
 	.x_max		= 0x0fff,
 	.y_max		= 0x0fff,
-	.x_plate_ohms	= 120,
+	.x_plate_ohms	= 180,
 	.pressure_max	= 200,
 	.debounce_max	= 10,
 	.debounce_tol	= 3,