ARM: EXYNOS: Remove broken config values for touchscren for NURI board

The atmel_mxt_ts driver has been extended to support more 'configuration
objects' in commit 81c88a71

 ("Input: atmel_mxt_ts - update object list"),
what broke the configuration values for NURI board. These values are
optional anyway, so remove them to get the driver working correctly.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>