input: atmel_mxt_ts: Clean up pdata and update config array

Remove blen, tchthr, x_line, y_line, orient and voltage from platform
data to not to overwrite the config data with these values. Update
config array to have the proper values.
Turn on i2c_pull_up in platform data.

Change-Id: Ic926e96886f52cea3dad29e9a44559b26c717259
Signed-off-by: Jing Lin <jinglin@codeaurora.org>