arm/dt: 8974: enable force update for touchscreen cfg data

Touchscreen configuration data must be provisioned by the
driver until such time that it is updated initially
in the factory.

Change-Id: I559a1b308f1d87a2ea8872b20d8dda7695c1b089
Signed-off-by: Amy Maloche <amaloche@codeaurora.org>