drivers: input: touchscreen: use dynamic touch rotate changes instead static way

Now the touch rotate value can be change from ramdisk

Default value is 90 (for CM builds)

To do: update function for another rotates: 180 and 270

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	on init

	# touch rotate
	write /sys/devices/platform/s3c2440-i2c.2/i2c-2/2-004a/pivot 0

OR

	on init
	# touch rotate
	write /sys/devices/platform/s3c2440-i2c.2/i2c-2/2-004a/pivot 90