ARM: imx_v6_v7_defconfig: Enable CONFIG_TOUCHSCREEN_DA9052

Enable the CONFIG_TOUCHSCREEN_DA9052 option, so that touchscreen
can be functional by default on imx53-qsb.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>