input: touchscreen: mxt: remove disable_irq

This change removes disable_irq call from
mxt_configure_objects(). Without this change
touch does not work on dual dsi which uses
atmel touch driver.

Change-Id: Ie215c8a08060d56d1f087490bf01f85a202fcb55
Signed-off-by: Harigovindan P <harigovi@codeaurora.org>